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Le Guide de l’Utilisateur
Bedienungsanleitung
SCM820 Digital IntelliMix ®
Automatic Mixer
USER GUIDE
27A20290 Rev. 4
©2017 Shure Incorporated
ii
IMPORTANT SAFETY INSTRUCTIONS
1. READ these instructions.
2. KEEP these instructions.
3. HEED all warnings.
4. FOLLOW all instructions.
5. DO NOT use this apparatus near water.
6. CLEAN ONLY with dry cloth.
7. DO NOT block any ventilation openings. Allow sufficient distances for adequate ventilation and install in accordance with the manufacturer’s instructions.
8. DO NOT install near any heat sources such as open flames, radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. Do not place any open flame sources on the product.
9. DO NOT defeat the safety purpose of the polarized or groundingtype plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wider blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
10. PROTECT the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
11. ONLY USE attachments/accessories specified by the manufacturer.
12. USE only with a cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
13. UNPLUG this apparatus during lightning storms or when unused for long periods of time.
14. REFER all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
15. DO NOT expose the apparatus to dripping and splashing. DO NOT put objects filled with liquids, such as vases, on the apparatus.
16. The MAINS plug or an appliance coupler shall remain readily operable.
17. The airborne noise of the Apparatus does not exceed 70dB (A).
18. Apparatus with CLASS I construction shall be connected to a MAINS socket outlet with a protective earthing connection.
19. To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.
20. Do not attempt to modify this product. Doing so could result in personal injury and/or product failure.
21. Operate this product within its specified operating temperature range.
This symbol indicates that dangerous voltage constituting a risk of electric shock is present within this unit.
This symbol indicates that there are important operating and maintenance instructions in the literature accompanying this unit.
WARNING: This product contains a chemical known to the State of California to cause cancer and birth defects or other reproductive harm.
Important Product Information
The equipment is intended to be used in professional audio applications.
Note: This device is not intended to be connected directly to a public internet network.
EMC conformance to Environment E2: Commercial and Light Industrial.
Testing is based on the use of supplied and recommended cable types.
The use of other than shielded (screened) cable types may degrade EMC performance.
Changes or modifications not expressly approved by Shure Incorporated could void your authority to operate this equipment.
This Class B digital apparatus complies with Canadian ICES-003. Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada.
Authorized under the verification provision of FCC Part 15B.
Please follow your regional recycling scheme for batteries, packaging, and electronic waste.
Information to the user
This equipment has been tested and found to comply with the limits for a Class
B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the receiver.
• Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Patent Notice
U.S. Patent 5,999,631
Other patents pending
Table of Contents
SCM820 Description
Front Panel
Rear Panel
Signal Path Diagram
Table of Contents
1
Dante Software by Audinate
Dante Controller
Dante Virtual Soundcard
Overview 2
IntelliMix
Operating Principles
Mixer Modes
Dual Mixer Operation
DFR and Audio Processing
Networking 2
Model Variations 2
2
2
2
2
Operating the Mixer 6
Front Panel Modes
Audio Mute and Bypass
Monitoring 6
6
6
3
3
4
5
14
14
14
Application Examples 15
Creating a Link Group
Integrating with Other Systems
Configuring for Use with a Choir
Internet Calling
Logic 16
15
15
15
16
Digital Feedback Reduction (DFR) 17
Function 17
Basic DFR Setup
Assigning DFR
Filter Types
Filter Width
17
18
18
18
The SCM820 Graphical User Interface
Graphical User Interface (GUI)
Accessing the GUI
Installation 8
Rackmounting 8
Power 8
Typical Audio Connections
Furnished Accessories
Configuring the Inputs and Outputs
8
8
9
7
7
7
GUI Description
Navigation Bar
Input Tab
Intellimix Tab
Digital Feedback Reduction (DFR) Tab
Output Tab
Link Group Tab
Preferences Tab
Log On Page
19
24
25
26
28
19
20
21
23
Troubleshooting 29
Event Log
Front-Panel Error Messages
30
30
Setting IntelliMix
Mixer Mode Descriptions
IntelliMix Parameters
Selecting the Mixer Mode
Single or Dual Mixer Operation
10
10
11
11
11
Specifications 31
Analog Connections
Digital Signal Processing
31
31
Networking 31
IP Ports and Protocols 32
Networking 12
Network Overview
Digital Audio Networking
12
12
Connector Diagrams 33
1
Overview
The Shure SCM820 is an 8-channel digital automatic mixer designed for use in speech applications, including sound reinforcement, broadcasting and audio recording. It dramatically improves audio quality in any application where multiple microphones are required. The mixer uses IntelliMix ® technology to select channels to open to the mix bus, while attenuating other channels. The mixing mode is selectable to allow a range of automatic mixing styles.
IntelliMix
®
Operating Principles
Expanding upon Shure's classic SCM810 IntelliMix technology, the digital
SCM820 delivers seamless automatic mixing by combining the following functions:
• Noise Adaptive Threshold (NAT) manages the audio system by distinguishing between dynamic audio (such as speech) and the noise floor (such as air conditioning). It continuously adjusts the activation threshold, so that only speech levels louder than the background noise open a channel.
• MaxBus ensures that only one channel is opened per sound source, reducing comb filtering for clear, intelligible speech.
• Number of Open Microphones Attenuation (NOMA) attenuates system gain as additional channels are opened, providing consistent output levels and better gain before feedback.
• Maintains the perceived ambient sound to achieve a natural sounding audio program even during long pauses in conversation.
Mixer Modes
The mixer operates in one of five Mix Modes: Classic, Smooth, Extreme,
Custom or Manual. The first three are factory settings that offer a range of reliable automixing styles. IntelliMix is configurable in Custom mode and turned off in Manual mode.
Classic
Classic mode emulates the default settings of the classic Shure SCM810 automixer. It is renowned for fast-acting, seamless channel gating and consistent perceived ambient sound levels.
Smooth
Smooth mode dynamically balances system gain between open and closed channels. The system gain remains consistent by distributing gain across channels to equal one open channel. This mode incorporates
IntelliMix operating principles into a gain sharing mixing style.
Extreme
Extreme is an aggressive variation of Classic mode, configured to achieve maximum gain before feedback by completely attenuating closed channels.
Custom
Custom mode allows individual IntelliMix parameters to be fine-tuned and tailored from the GUI.
Manual
Manual mode deactivates IntelliMix to operate as a standard mixer.
Channel and mix equalization, output limiter and mix bus routing are still active in this setting.
DFR and Audio Processing
The SCM820 features two channels of Digital Feedback Reducer (DFR).
DFR uses Shure’s patented Adaptive Notch Filter algorithm to detect feedback and deploy up to 16 narrow-band notch filters, dramatically improving gain-before-feedback in a sound reinforcement system. DFR can be applied to any two channels of the SCM820, including the mix outputs.
Additionally, the mixer provides adjustable input equalization, limiting and a parametric output EQ to optimize the sound in any application.
Networking
Dante
TM
Digital Audio
Digital audio is carried over standard Ethernet using shielded Cat5e (or higher) cables. Dante provides low latency, tight clock synchronization, and high Quality-of-Service (QoS) to provide reliable audio transport to a variety of Dante devices. Dante audio can coexist safely on the same network as IT and control data, or can be configured to use a dedicated network.
Audio can be played or recorded to a PC or Mac using Dante Virtual
Soundcard (DVS), using the computer’s standard Ethernet connection.
Remote Control
The SCM820 can connect to a computer or 3rd party control system (AMX,
Crestron) for remote control and monitoring. The web browser-based graphical user interface (GUI) enables custom IntelliMix configuration and access to additional features.
Linking Mixers
SCM820-DAN mixers can be linked to form large automixes of up to 12 units (96 channels of audio). Mixers in the same link group operate under shared IntelliMix settings. A back-panel auto link button enables mixers to automatically link when they join the network. To link specific mixers, custom groups can be created and managed from the GUI.
Model Variations
The following table describes the four SCM820 model variations:
Model
Connector Type
Description
Network Card
SCM820
SCM820-DAN
SCM820-DB25
Block
Block
DB25
SCM820-DAN-DB25 DB25
Standard Ethernet
Dante Digital Audio
Standard Ethernet
Dante Digital Audio
Dual Mixer Operation
The SCM820 can operate as a single or dual mixer:
Single Mixer: Channels are routed to a single mix bus that sends the same audio to both Mix A and B outputs. This allows the same program to be sent to different rooms or recording applications. Output gain, parametric equalizer and limiter can be set separately for each mix.
Dual Mixer: Two separate buses provide independent automixes for each mix output. This allows two entirely different mixes to result from the same set of inputs. This is useful when the mixer is being used for two applications. For example, set Mix A to Classic mode for sound reinforcement, and set Mix B to Smooth for a broadcast feed. As a dual mixer, channels can be routed to Mix A, Mix B, Mix A and B, or neither mix bus.
SCM820
SCM820-DAN
SCM820-DB25
SCM820-DAN-DB25
OUT mix a
AUX IN
L R +
IN
+ mix b
+ direct out
+
IN
+
8 direct out
+
IN
+
7 direct out
+
IN
+
6 direct out
+
IN
+
5 direct out
+
IN
+
4 direct out
+
IN
+
3 direct out
+
IN
+
2 direct out
1
A
INTELLIMIX
B manual
A smooth classic extreme custom
B
CHANNEL line
+0dB
CH mic
+30dB mic
+46dB dual mixer phm 48 VDC auto link lockout
OUT mix a
AUX IN
L R
+
IN
+ mix b
+ direct out
+
IN
+
IN
+
8 direct out
+
7 direct out
+
IN
+
IN
+
IN
+
6 direct out
+
5 direct out
+
4 direct out
+
IN
+
IN
+
3 direct out
+
2 direct out
1
A B manual A smooth classic extreme
B
CHANNEL line
+0dB
CH mic
+30dB mic
+46dB custom dual mixer phm 48 VDC auto link secondary lockout primary reset
MIX A
MIX OUTPUTS
MIX OUTPUTS
MIX B
L +R
SUM
AUX IN
L +R
SUM
AUX IN
INPUTS 1-8
INPUTS 1-8
DIRECT OUTPUTS 1-8
DIRECT OUTPUTS 1-8
A
INTELLIMIX
B manual
A smooth classic extreme
B
CHANNEL line
+0dB
CH mic
+30dB mic
+46dB custom dual mixer phm 48 VDC auto link lockout reset reset
A B manual smooth
A classic extreme
B
CHANNEL line
+0dB
CH mic
+30dB mic
+46dB custom dual mixer phm 48 VDC auto link secondary lockout primary reset
Upgrading to Dante
A standard SCM820 can be upgraded with the Dante Network Interface
Card (A820-NIC-DAN) to add full digital audio networking capabilities. This replaces the standard Ethernet port with two Dante network ports. This should only be installed by qualified service personnel. Visit www.shure.com for more details.
2
SCM820 Description
gain low cut hi shelf meter
1
SCM820
2
④
3
① ② ③
4 5 push to solo | hold to mute
6 7 8
⑤
AUX IN
L+R SUM
MASTER
⑨ ⑩ ⑫ ⑬ gain limiter
A B
LIM
A
0
-9
-18
-24
-36
-48
-60
B power ethernet network audio automix link dual mixer
IntelliMix ®
HEADPHONE lockout
⑥ ⑦
⑧ ⑪
⑭ ⑮
Front Panel
① Channel Mode Selection
Press the button to select the function of the channel knobs and monitor
LED rings. See the Audio Signal Adjustment section for details on each mode.
② Assignable Channel Knob
Adjusts settings and status for each input:
Rotate: Adjusts a setting.
Momentary Press: Solos the channel to the headphone output.
Press and Hold: Mutes the audio or bypasses the EQ setting.
③ Monitor LED Ring
13 LED segments display gain setting, input signal meter, IntelliMix gain meter, channel solo, or EQ setting.
④ Channel Status LED
LED
Off
Green
Amber
Flicker Red
Solid Red
Channel Status
Channel is closed (attenuated in the automix).
Channel is open (selected in the automix).
Channel EQ is bypassed.
Signal is clipping. Set the channel to a lower input gain level.
Channel is muted.
⑤ Auxiliary Input Jack (1/8")
Unbalanced aux input sums left and right channels to mono. Front and back panel aux inputs are summed to a mono signal and routed without
automixing to the mix outputs.
⑥ Master Output Knob
Adjusts settings and status of the mix outputs. See Front Panel Modes for details.
Rotate: Adjusts output gain or limiter threshold.
Momentary Press: Overrides a soloed channel to return the mix to the headphone output.
Press and Hold: Mutes the audio or bypasses the limiter.
⑦ Master LED Ring
Displays gain setting or limiter threshold. A single LED represents each mixer when they are both selected but set to different levels.
⑧ Master Mode Selection
Selects the function (gain or limiter) of the master knob and LED ring.
⑨ Mix Select Button
Selects Mix A, Mix B, or both for adjustment with the master knob and monitoring on the LED ring and headphone output. Note: When both Mix
A and Mix B are selected, the headphone output only monitors Mix A.
⑩ Mix Status Indicator
LED
Green
Amber
Red
Limiter is bypassed.
Mix is muted.
Mix Status
Mix is selected for adjustment and listening on the headphone output.
⑪ Audio Output Meters
Monitor the output signal level and limiter threshold for mix A and B.
⑫
LIM
(Limiter) LEDs
Illuminate amber when the audio levels exceed the limiter threshold.
⑬ System Status Indicators
The LEDs illuminate to indicate system settings: power lockout
LED ethernet network audio automix link dual mixer
Color Status
Green
Green
Green
Flashing Green
One or more connected receive channels experiencing a subscription error or is unresolved
(transmitting device is off, disconnected, renamed or has incorrect network setting).
Clock synchronization problem.
Red
Off
Green
No receive channels connected
(routing has not been established).
Two or more mixers are connected in a link group.
Flashing Green Link Group is configuring.
Off
Green
Unit is powered on.
Unit is connected to a network.
All connected receive channels are OK (receiving digital audio as expected).
Off
Red
Flashing Red
Mixer is in standalone mode.
Mixer is set to Dual Mixer operation.
Mixer is set to Single Mixer operation.
Front panel controls are locked.
An adjustment is attempted in lockout mode.
⑭ Headphone Volume Knob
Adjust the volume of the headphone output.
⑮ Headphone Output Jack (1/4 in.)
Monitor a mix or a soloed channel.
3
①
②
①
②
③ ④
OUT mix a
AUX IN
L R
+
IN
⑤ ⑥ ⑦
+
IN
+
IN
+ mix b
+ direct out
+
8 direct out
+
7 direct out
MIX OUTPUTS
MIX A
③
MIX B
L +R
SUM
AUX IN
Rear Panel
① Power Switch
Turns the unit on or off.
② AC Power Jack
Supplies AC power to the mixer when plugged into a power source.
③ Mix A and Mix B Outputs
Active balanced outputs connect to amplifiers, DSP, mixer, or recording device.
④ Auxiliary Input Jack
Unbalanced aux input sums left and right channels to mono. Front and back panel aux inputs are summed to a mono signal and routed without
automixing to the mix outputs.
⑤ Channel Inputs 1–8
Active-balanced microphone- or line-level inputs.
Block Connectors
+
: Audio +
: Audio −
: Audio ground gate
: Logic gate out mute
: Logic mute in ovrd
: Logic override in gnd
: Logic ground
DB25 Connector
Pins: Audio plus, audio negative and audio ground. See Specifications for details.
⑥ Direct Outputs 1–8
Each channel has a dedicated, impedance-balanced direct output on the back panel that can be selected from one of five stages in the signal path. See Configuring the Inputs and Outputs for details on direct output routing.
⑦ Chassis Ground Screw 1–8
Provides an optional connection for microphone shield wire to chassis ground.
⑧ IntelliMix Select Buttons
Scrolls through IntelliMix presets for each mix output. When dual mixer
is off, the
A
button sets the mode for both Mix A and Mix B.
⑨ Dual Mixer Button
Sets the SCM820 as a dual mixer, indicated by the green LED.
⑩ Channel Select Button and Display
Press to select a single channel (1–8) or all channels (A) when changing input gain or phantom power.
• When all channels are selected (A), Input Level and Phantom Power
LED indicators only illuminate if all channels have the same setting.
• L is displayed when the mixer is in lockout mode.
+
IN
+
IN
+
6 direct out
+
5 direct out
④
INPUTS 1-8
⑤
+
IN
+
4 direct out
3 direct out
DIRECT OUTPUTS 1-8
⑥
+
IN
+
+
IN
+
2 direct out
1
A
A
INTELLIMIX
B manual
A smooth classic extreme custom
B dual mixer manual smooth classic extreme custom
B
A
CHANNEL line
+0dB
CH mic
+30dB mic
+46dB phm 48 VDC
CHANNEL line
+0dB
CH mic
+30dB mic
+46dB auto link lockout
⑭ ⑮ reset secondary primary phm 48 VDC auto link dual mixer lockout reset
⑭ ⑮
A
INTELLIMIX
B manual
⑧⑩
CHANNEL
A line
+0dB
⑪ smooth classic
B CH mic
+30dB mic
+46dB extreme custom phm 48 VDC dual mixer auto link
⑨ ⑫ ⑬ secondary
⑰ ⑱ primary
⑰ ⑱
00:0E:DD:AA:BB:CC
00:0E:DD:AA:BB:CC
⑪ Input Gain Selection and LED Indicator
Sets the analog input gain level for the selected channel(s), illuminating the green LED. All LEDs are off when the channel's audio source is set to
Network from the GUI.
⑫ Phantom Power Button and LED Indicator
Supplies 48 VDC phantom power to the selected channel(s), illuminating the green LED. Phantom Power is disabled in the line (+0dB) gain setting.
⑬ Auto Link Button and LED Indicator
Enables networked SCM820-DAN mixers to automatically form a link group. Link Groups enable a larger audio mix by incorporating inputs from two or more mixers. See Link Groups for more details.
⑭ Lockout Button and LED Indicator
Hold for five seconds to disable front and back panel controls. The front panel lockout
LED illuminates red (flashing red during an adjustment attempt) and the back panel channel display shows
L
.
⑮ Reset Button
Press and hold for five seconds to reboot the mixer with default system settings restored.
⑯ Network Ports
RJ-45 jacks for network connection.
⑰ Network Status LED (Green)
Off = no network link
On = network link established
Flashing = network link active
⑱ Network Speed LED (Amber)
SCM820:
Off = 10 Mbps
On = 100 Mbps
SCM820-DAN:
Off = 10/100 Mbps
On = 1 Gbps
4
Signal Path Diagram
The following diagram shows the audio signal path and the routing options for several features (default configuration shown). Use the GUI to change the configuration.
Input Meter
Mode
CHANNEL
INPUTS 1 - 8
Analog
Input
Trim
Line +0
Mic +26
Mic +46
A
D
Dante
Network
EQ
Audio Source
(Channel)
Headphone
Mode
DFR
Digital Feedback
Reducer
Fader
Routing
(Channel)
Mute
Control
IntelliMix Gain
IntelliMix A
NOMA
IntelliMix Gain
IntelliMix B
NOMA
Mix A Mix B
AUX INPUT
Front Panel
Analog
Left
Right
Back Panel
Analog
Dante
Network
L/R
Left
Right
A
D
A
D
A
D
A
D
Sum
Aux L
Sum
Aux R
Audio Source
(Aux)
Sum to
Mono
Global/Local (Mix)
EQ
Fader
Routing
(Aux)
Direct Output
Selection
D
A
Direct Outputs
(1-8)
Analog
Gating
Logic
Dante
Network
Sum
Mix A
Headphone
Mode
Digital Feedback
Reducer
DFR
Mix
Selection
Parametric EQ Master Fader Limiter
LIM
A
0
-9
-18
-24
-36
-48
-60
B
D
A
Output Pad
(-0, -20, -46)
Mix Outputs
(A and B)
Mix A
Analog
Sum
Mix B
Single/Dual
Mixer
Digital Feedback
Reducer
DFR
D
A
Output Pad
(-0, -20, -46)
Mix B
Analog
Dante
Network
Aux Output
L/R
Dante
Network
Global/Local (Aux)
Sum
Mix B
Sum
Mix A
Link Group Outputs to other units
Link Group Outputs from other units
IntelliMix® low cut hi shelf meter
1
IntelliMix® low cut hi shelf meter
1 2 3 4 5 push to solo | hold to mute
6
IntelliMix® low cut hi shelf gain meter
1 2
IntelliMix®
1 low cut hi shelf gain meter
2 3
3 4 5 push to solo | hold to mute
6
4 5 push to solo | hold to mute
6
IntelliMix®
1 low cut hi shelf meter
2 3 4 5 push to solo | hold to mute
6
IntelliMix®
1 low cut hi shelf meter
2
2
3
3
4 5 push to solo | hold to mute
6
4 5 push to solo | hold to mute
6
7
7
7
7
8
8
7 8
7 8
8
8
IntelliMix®
1 low cut hi shelf meter
2 3 4 5 push to solo | hold to mute
6 7 8
AUX IN
MASTER A B LIM limiter gain -24
-36
-60 -48 L+R SUM power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
MASTER gain limiter
A B LIM
-24
-36
-60 -48 L+R SUM power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER gain limiter
A B LIM
-24
-36
-60 -48 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER A B LIM gain limiter
-24
-36
-60 -48 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
MASTER A B LIM limiter gain -24
-36
-60 -48 L+R SUM power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
MASTER A B LIM limiter gain -24
-36
-60 -48 L+R SUM power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
MASTER A B LIM limiter gain -24
-36
-60 -48 L+R SUM power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
Mix A
Mix B
5
Front Panel Modes
gain low cut hi shelf ch. meter hi shelf ch. meter i i iiiiii i i iiiiii +0 dB
-∞ dB +18 dB
IntelliMix®
1 gain low cut hi shelf meter
2
IntelliMix® gain
3 low cut
4
1
5 hi shelf meter push to solo | hold to mute
6 7
2
8
3
AUX IN
L+R SUM gain limiter
A B LIM
A
-18
-9
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE low cut
-9
0
A i i iiiiii
-∞ dB +18 dB
+0 dB
For Channels 1-8 and Aux
L+R SUM
Mode
Selector gain ch. meter
-36
-48
-60 gain i i iiiiii push to solo | hold to mute i i iiiiiii hi shelf ch. meter i i iiiiiii hi shelf gain i i iiiiii
For Mix
Outputs
+0 dB
-∞ dB
92 Hz
-∞ dB
Channel Inputs
hi shelf hi shelf
25 Hz
The channel knobs operate in five modes for different types of input signal
-∞ dB
92 Hz
25 Hz
320 Hz from the following modes.
Channel Gain ( gain
)
Adjust gain within a 128 dB range while displaying the gain setting on the LED ring. Unity gain is at the
9th LED.
Low Cut ( low cut
)
Adjust the frequency of the low cut filter (6 dB/octave from 25 to 320 Hz). Use to remove low-frequency noise such as table vibrations or air-conditioning rumble.
High Shelf ( hi shelf
)
Adjust the high shelf boost or cut (± 12 dB at 5 kHz). Use to add presence to muddy vocals, temper sibilant vocals, or enhance the sound of off-axis lavalier microphones.
Input Signal Meter ( adjustments.
ch. meter
)
LEDs display the input signal level in real-time.
Channel gain is adjustable in this mode, and will momentarily display channel gain setting during
IntelliMix Gain Meter ( gain
and ch. meter
)
LEDs display the IntelliMix attenuation applied in realtime. Channel gain is adjustable in this mode, displaying the setting on the LEDs during adjustments.
IntelliMix® gain low cut hi shelf meter
1 2 gain low cut gain low cut low cut gain low cut hi shelf ii iiiiiii low cut
i i i i i i i i i ii iiiiiii i i iiiiiii ch. meter gain low cut hi shelf gain low cut hi shelf low cut low cut i i iiiiiii ii iiiiiii
i i iiii i i i ii iiiiiii i i iiiiiii hi shelf ch. meter hi shelf ch. meter ii iiiiiii iiiiiii
ii i iii i i i low cut hi shelf ch. meter hi shelf ch. meter ii iiiiiii ii iiiiiii ii iiiiiii
i i i iii i i i iiiiiii
3 low cut hi shelf gain low cut hi shelf low cut gain ii iiiiiii ii iiiiiii
ii i iii i i i ii iiiiiii ii iiiiiii
ii i iii i i i ii iiiiiii ii iiiiiii
92 Hz
320 Hz
25 Hz
+0 dB
320 Hz
+18 dB
-12 dB +12 dB
-12 dB
25 Hz
+0 dB
320 Hz
-12 dB
92 Hz
+12 dB
25 Hz
25 Hz
-60 dBFS
320 Hz
0 dBFS
-60 dBFS 0 dBFS
-16 dBFS
+0 dB 0 dBFS
-15 dB
+12 dB
-15 dB 0 dBFS
+12 dB
-80 dB
4
-15 dB
0 dB
0 dBFS
0 dB hi shelf
-80 dB 0 dB ii iiiiiii low cut hi shelf ch. meter low cut hi shelf ch. meter ii
-16 dBFS 0 dBFS
MASTER
MASTER
-15 dB
0 dB
A B ii
MASTER
+0 dB
A B
5
Mix Outputs
The mix output knob operates in two modes to control the mix output. Use the master function button to select one of two modes.
gain low cut hi shelf ii iiiiiii
MASTER ii iiiiiii gain
+18 dB limiter
A B ii iiiiiii
ii i iii i i i
Output Gain ( gain
)
Rotate to adjust the output gain of the selected mix.
The output signal level is displayed on the meters.
Limiter Threshold ( limiter
)
Rotate to adjust the limiter threshold of the mix (−2 to −50 dBFS). The limiter threshold level is displayed on the meters.
-∞ dB hi shelf ch. meter ii iiiiiii
+18 dB
MASTER
MASTER gain limiter
-∞ dB +18 dB
-80 dB
-24 dBFS
+0 dB
0 dB ii iiiiiii gain
A B
A B ii iiiiiii
MASTER
-50 dBFS
+0 dB gain
-2 dBFS
A B
ii i i i i i i i
A B ii ii iiiiiii ii iiiiiii
-50 dBFS -2 dBFS
MASTER
-∞ dB +18 dB
-2 dBFS gain
A B ii iiiiiii
Audio Mute and Bypass
A B ii iiiiiii
Mute Channel Input
Press and hold the input channel knob while in channel status LED turns red. gain
or
MASTER ch. meter
-50 dBFS limiter
+18 dB gain
mode. The
-2 dBFS ii
A B
Mute Mix Output turns red.
MASTER gain
Press and hold the
MASTER
knob while in gain
mode. The mix status LED
-50 dBFS -2 dBFS ii iiiiiii
Bypass Input EQ
Press and hold the input channel knob while in channel status LED turns amber. low cut
or hi shelf
-50 dBFS gain ii iiiiiii
mode. The
-2 dBFS
Bypass Output Limiter
Press and hold the
MASTER
knob while in limiter
mode. The mix status
LED turns amber.
Monitoring
Headphone Output
Use the front panel headphone jack for monitoring audio. By default, the headphones monitor the mix prefader/post-EQ (change to post-fader/post-limiter from
GUI > Preferences Tab).
Solo to Headphones
A channel can be soloed to the headphone jack.
Solo Channel: Press a channel knob to solo that channel to the headphones. The other LED rings dim to highlight the soloed channel.
Exit Solo: Press the soloed channel knob or press the
Master
knob to return the mix to the headphones.
Input Meters
The front panel channel meters can be set to display real-time signal information. Use the front panel mode selection button to scroll to the desired mode: gain low cut hi shelf meter
IntelliMix®
1 2 3 4 5 6 7 8
AUX IN
L+R SUM
Input Signal Level
The channel meter mode ( ch. meter
) displays real-time audio input signal level for each channel.
IntelliMix Gain
The IntelliMix meter mode ( gain
and ch. meter
illuminated) displays
IntelliMix gain operation in real-time across the channel LEDs. Channels that gate open will display more gain than channels that are closed
(attenuated) in the mix.
Output Meters
The output meters indicate the level of each mix before the digital-to-analog conversion. By default, the meter displays average and peak audio levels.
It is good practice to use −18 dBFS on the SCM820
L+R SUM meter as an approximation of 0 VU on an analog meter.
LED
Red (7)
Yellow (6)
Yellow (5)
Green (4)
Green (3)
Green (2)
Green (1)
Clip
Description
Normal peaks
Signal Present
MASTER A B gain limiter
LIM
A
0
-9
-18
-24
-36
-48
-60
B
Signal Level (dBFS)
0 to -6
-6 to -9
-9 to -18
-18 to -24
-24 to -36
-36 to -48
-48 to -60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
Changing the Metering Type
Go to the Preferences tab of the GUI to change the following metering options:
• Meter Type: Change the input and output meters from displaying VU +
Peak (default) to VU or Peak.
• IntelliMix Gain Metering: The Input tab of the GUI can display input signal level (default) or IntelliMix gain metering in realtime.
6
The SCM820 Graphical User Interface
Graphical User Interface (GUI)
The SCM820 graphical user interface (GUI) enables comprehensive control of the mixer from a web browser. The GUI is hosted from a webserver embedded on the SCM820, and is accessible from any computer on the network. Use the GUI for the following functions:
• Manage mixers from a remote location.
• Customize IntelliMix parameters.
• Form large automixes with custom link groups.
• Assign the direct outputs in the signal path.
• Configure Redundant or Split networks.
• Set up and monitor DFR for up to two channels in each mixer.
Accessing the GUI
The Shure Web Server Discovery application finds all Shure devices on the network that feature a web-based GUI. Follow these steps to install the software and access the SCM820 GUI:
① Install the Shure Discovery application
Get the Shure Web Device Discovery Application to see devices on the network and open the control interface. Download the software tool).
② Connect the network
Ensure the computer and the mixer are on the same network.
③ Launch the Discovery application
The app displays all Shure devices that feature a GUI.
④ Open the SCM820 GUI
Double-click on a device to open its GUI in a web browser.
⑤ Bookmark the GUI (recommended)
Bookmark the device's DNS name to access the GUI without the
Shure Discovery app.
System Requirements
• Windows: Windows XP (32 and 64 bit), Windows Vista and Windows 7
• Apple: Mac OSX 10.6.0 and higher
• Latest version of Adobe Flash Player
• Bonjour software (bundled with the Shure Discovery app)
• The GUI is supported on the following web-browsers: Internet Explorer,
Firefox, Safari and Chrome.
①
④ secondary primary secondary primary secondary primary secondary primary secondary primary secondary primary
IntelliMix® low cut gain meter hi shelf
IntelliMix® low cut gain meter hi shelf
IntelliMix® low cut gain meter hi shelf
IntelliMix® gain hi shelf low cut meter
IntelliMix® gain hi shelf low cut meter
IntelliMix® low cut gain meter hi shelf push to solo | hold to mute push to solo | hold to mute push to solo | hold to mute push to solo | hold to mute push to solo | hold to mute push to solo | hold to mute
AUX IN MASTER limiter
A B
L+R SUM ethernet power automix link network audio dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER A B limiter
AUX IN
L+R SUM
MASTER limiter
A B ethernet power automix link network audio dual mixer lockout
SCM820
HEADPHONE power network audio ethernet
SCM820
HEADPHONE dual mixer automix link lockout
AUX IN MASTER limiter
A B
L+R SUM power network audio ethernet
SCM820
HEADPHONE dual mixer automix link lockout
AUX IN MASTER limiter
A B
L+R SUM
AUX IN
L+R SUM
MASTER A B limiter ethernet power automix link network audio dual mixer lockout
SCM820
HEADPHONE ethernet power automix link network audio dual mixer lockout
SCM820
HEADPHONE secondary primary secondary primary secondary primary secondary primary secondary primary secondary primary
IntelliMix® gain hi shelf low cut meter
IntelliMix® low cut gain meter hi shelf
IntelliMix® low cut gain meter hi shelf
IntelliMix® gain hi shelf low cut meter
IntelliMix® gain hi shelf low cut meter
IntelliMix® low cut gain meter hi shelf push to solo | hold to mute push to solo | hold to mute push to solo | hold to mute push to solo | hold to mute push to solo | hold to mute push to solo | hold to mute
AUX IN MASTER limiter
A B
L+R SUM ethernet power automix link network audio
SCM820
HEADPHONE dual mixer lockout
AUX IN
L+R SUM
AUX IN
L+R SUM
MASTER A B
MASTER limiter limiter
A B ethernet power automix link network audio
SCM820
HEADPHONE dual mixer lockout power
SCM820 network audio ethernet HEADPHONE dual mixer automix link lockout
AUX IN MASTER limiter
A B
L+R SUM power network audio ethernet
SCM820
HEADPHONE dual mixer automix link lockout
AUX IN MASTER limiter
A B
L+R SUM
AUX IN
L+R SUM
MASTER A B limiter ethernet power automix link network audio
SCM820
HEADPHONE dual mixer lockout ethernet power automix link network audio
SCM820
HEADPHONE dual mixer lockout
② ③
SCM820-DAN
SCM820
ROOM 5
CONFERENCE
SCM820-Dan-ffeee5.local
SCM820-ffaaa2.local
192.168.200.22
192.168.200.23
Dante
IntelliMix® gain low cut hi shelf meter secondary primary
AUX IN MASTER gain limiter
A B LIM
-24
-36
-60 -48 L+R SUM power network audio ethernet automix link dual mixer lockout
SCM820
HEADPHONE push to solo | hold to mute
⑤ secondary primary
SCM820-Dan-ffeee5.local
SCM820-ffaaa2.local
MXWAPT8-fffee8.local
secondary primary
192.168.200.22
192.168.200.23
192.168.200.24
IntelliMix® gain hi shelf low cut meter
IntelliMix® gain low cut meter hi shelf
IntelliMix® gain hi shelf low cut meter
IntelliMix® gain low cut meter hi shelf secondary primary push to solo | hold to mute push to solo | hold to mute push to solo | hold to mute push to solo | hold to mute secondary primary
AUX IN
L+R SUM
MASTER A B LIM limiter gain
-18
-24
-48 -36
-60
SCM820 ethernet power network audio
HEADPHONE dual mixer automix link lockout
AUX IN
L+R SUM
MASTER A B LIM limiter gain -24
-36
-60 -48 power ethernet automix link network audio dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER A B LIM limiter gain
-18
-24
-48 -36
-60
SCM820 ethernet power network audio
HEADPHONE dual mixer automix link lockout
AUX IN
L+R SUM
MASTER A B LIM limiter gain
-18
-36 -24
-60 -48 power ethernet automix link network audio dual mixer lockout
SCM820
HEADPHONE
IntelliMix® gain hi shelf low cut meter secondary primary
AUX IN
MASTER gain limiter
A B LIM
-18
-24
-48 -36
-60 L+R SUM ethernet power network audio dual mixer automix link lockout
SCM820
HEADPHONE push to solo | hold to mute
Accessing the GUI without the Discovery App
If the Discovery application is not installed, the SCM820 GUI can be accessed by typing the DNS name into an internet browser. The DNS name is derived from model of the unit (SCM820 or SCM820-DAN), in combination with the last three bytes (six digits) of the MAC address, and ending in
.local
.
Format Example: If the MAC address of a unit is 00:0E:DD:AA:BB:CC, then the link is written as follows:
• SCM820-DAN: http://SCM820-DAN-aabbcc.local
• SCM820: http://SCM820-aabbcc.local
OUT mix a
AUX IN
L R +
IN
+ mix b
+ direct out
+
IN
+
8 direct out
+
IN
+
7 direct out
+
IN
+
IN
+
6 direct out
+
5 direct out
+
IN
+
4 direct out
+
IN
+
3 direct out
+
IN
+
2 direct out
A
INTELLIMIX
B manual
A smooth classic
B extreme custom dual mixer
CHANNEL
CH mic
+30dB mic
+46dB phm 48 VDC
IntelliMix direct out secondary lockout primary reset
7
Installation
Power
Connect the unit to AC power using the supplied IEC cable. Turn on the power switch.
OUT mix a
AUX IN
L R +
IN
+ mix b
+
IN
+
IN
+
IN
+
IN
+
IN
+ direct out
+
8 direct out
+
7 direct out
+
6 direct out
+
5 direct out
+
4 direct out
+
IN
+
IN
+
3 direct out
+
2 direct out
1
A B manual
A smooth classic
B extreme custom
CHANNEL line
+0dB
CH mic
+30dB mic
+46dB dual mixer phm 48 VDC auto link secondary lockout primary reset
00:0E:DD:AA:BB:CC
Furnished Accessories
Hardware Kit (SCM820, SCM820-DAN) 90A20082
Hardware Kit (SCM820-DB25,
SCM820-DAN-DB25)
Ethernet cable
90BA8100
95D15103
Power Cable region dependent, see table
Rackmounting
Rackmount the mixer using the screws and washers supplied in the Hardware Kit.
Follow these general best practices when rackmounting equipment:
• Ambient temperature of the rack should not exceed specified operating temperature range of the device.
• Keep fan inlet and side air vents clear from obstructions and provide adequate space for airflow within the rack.
• When possible, provide 1 RU of empty space between each device.
Power Cable by Region
US
Brazil
Argentina
Europe
UK
Japan
China
Korea
Australia
Part Number
95B8389
95A14336
95A14335
95C8247
95A8713
95B9021
95B9073
95B9074
95A9128 gain low cut hi shelf meter
1 2 3 4 5 push to solo | hold to mute
6 7 8 gain low cut hi shelf meter
1 2 3 4 5 push to solo | hold to mute
6 7 8 gain low cut hi shelf meter
1 2 3 4 5 push to solo | hold to mute
6 7 8
AUX IN
L+R SUM
MASTER gain limiter
A B LIM
-9
-18
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
HEADPHONE
AUX IN
L+R SUM
MASTER gain limiter
A B LIM
-9
-18
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
HEADPHONE
AUX IN
L+R SUM
MASTER gain limiter
A B LIM
-9
-18
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
HEADPHONE
Typical Audio Connections
① Channel Inputs
• Microphones
• Insert send from a mixer
• Dante network audio
+
+
+
+
+
+
+
+
+
3
+
4
5
6
1
L + R
SUM
Aux In
Inputs 1-8
Inputs 1-8
③ Mix Outputs
• Amplifier
• Powered speakers
• Mixer channel inputs
+
+
+
+
+ 8
7
+
+
+
+
+
+
6
MIX OUTPUT
S
5
+
L + R
SUM
Aux In
4
+
Inputs 1-8
3
+
+
MIX B
MIX A
6
② Aux Inputs
Aux-level sound sources:
• MP3 player
• Computer headphone output
• CD player
7 8
AUX IN
MASTER gain limiter
A B LIM
A
0
-9
-18
-24
-36
-48
-60
B power ethernet network audio automix link dual mixer lockout
HEADPHONE
L+R SUM
MIX A
MIX OUTPUT
S
MIX B
L + R
SUM
Aux In
Inputs 1-8
+
+
+
8
+
+
7
+
+
6
④ Direct Outputs
• Insert returns to a mixer
• Recording device
• Mixer channel inputs
+
+
+
+
+
+
+
+
3
+
4
+ 5
6
7
L + R
SUM
Aux In
+
+
1
Direct Outputs 1-8
8
Configuring the Inputs and Outputs
Unless where noted, configurations can be made from the hardware or from the GUI.
Inputs
① Select the Audio Source (GUI only)
• Analog (default): Audio is from a microphone or line-level audio source connected to a channel input on the mixer back panel.
• Network: Audio is from the Dante digital audio network. Go to the Inputs tab of the GUI to select Network audio for each desired channel. Dante
Controller software is required to properly route audio to the channel inputs.
② Select the Input Gain
Select the analog input gain for each channel. No gain is applied for analog line-level or when the audio source is set to Network.
• Mic (+46dB): For less sensitive microphones, such as dynamics.
• Mic (+26dB): For loud talkers or sensitive microphones such as condensers.
• Line (+0dB): For line-level sources such as mixer inserts.
③ Supply Phantom Power
Supply 48 V phantom power to the channel when using condenser microphones. (Phantom power is disabled when Input gain is set to Line.)
④ Adjust Channel EQ
Adjust the high- and low-frequency equalization to improve intelligibility and reduce undesired noise:
• Low Cut: Ideal for attenuating low-frequency vibration caused by table vibrations or air-conditioning rumble. Adjust the frequency of the 12 dB/ octave filter from 25 - 320 Hz.
• High Shelf: For tempering sibilant speech or enhancing the sound of offaxis microphones. Use this to boost or cut the signal by 12 dB at 5 kHz with a slop of 12dB/octave.
Direct and Mix Outputs
⑤ Assign the Direct Outputs (GUI Only)
Assign the Direct Output for each channel from the Output tab of the GUI.
• Pre-EQ: After the Input Gain
• Post-EQ: After the EQ blocks
• Post-Fader: After the channel fader
• IntelliMix: After the IntelliMix gating decision
• IntelliMix NOMA: After IntelliMix gating and NOMA decisions
⑥ Set Mix Output Level (GUI Only)
Set the Output level according to the input of the connecting equipment:
• Line (-0) (default): No attenuation to the output level.
• Aux (-20): The signal is attenuated 20 dB to avoid clipping a line input.
• Mic (-46): The signal is attenuated 46 dB to match a microphone input.
⑦ Set the Limiter
The output limiter prevents distortion during loud program peaks without affecting normal program levels. This prevents overloading the devices connected to the mixer outputs.
⑧ Adjust the Output Gain
Adjust the overall output level of the mix.
Auxiliary (Aux) Input
The SCM820 features two auxiliary inputs: an 1/8” jack on the front panel and a back panel input (block connector or RCA connectors, depending on the model). Each input sums the left and right channel to a mono signal. This mono signal is routed directly to the mix outputs, bypassing the automixing process. Use this input for sources such as an MP3 player or computer speaker output.
Digital Channels
When the mixer is connected to a Dante network, the left and right channels are accessible before they sum to the mono signal for the mix outputs. Use the Aux L and Aux R channels in Dante Controller to route audio to and from the aux channel.
9
Setting IntelliMix
The SCM820 uses IntelliMix to select channels to open in a mix, while attenuating the gain of closed channels. IntelliMix is available in three presets and can be customized to excel in any application where multiple microphones are used at once. In all modes (except Manual), MaxBus ensures that only one channel is opened per sound source.
Mixer Mode Descriptions
The SCM820 features five mix modes: Classic, Extreme, Smooth, Custom or Manual.
Classic
Classic mode emulates the classic Shure SCM810 automixer (in its default settings). It is renowned for fast-acting, seamless channel gating and consistent perceived ambient sound levels. The Classic mode excels in most applications, specifically sound reinforcement and teleconferencing.
Gating Style:
Gain Scaling:
Off Attenuation:
Last Mic Lock On:
Full
Fixed
−15 dB
Enabled
-15 dB
1 Talker
Channel Gain in Classic Mixer
Full gain is applied as the channel opens; off attenuation gain is applied to all channels.
-15 dB
-15 dB
2+ Talkers
As additional channels open,
NOMA factor decreases the level of all channels.
-15 dB
Smooth
Smooth dynamically balances system gain between open and closed channels. The system gain remains consistent by distributing gain across channels to equal one open channel. It incorporates IntelliMix operating principles into a gain sharing mixing style, making it ideal for broadcast and recording applications.
Gating Style:
Gain Scaling:
Off Attenuation:
Last Mic Lock On:
Relative
Adaptive
Disabled
Disabled
Tip: Unroute all unused channels to the mix bus. This will ensure the most consistent noise floor in Smooth mode.
-15 dB
-15 dB
1 Talker
-15 dB
-15 dB
-15 dB
2+ Talkers
Relative gain is applied to the open channel; all channels adaptively attenuate to maintain system gain.
As additional channels open, gain is adaptively distributed across all channels to maintain system gain.
Extreme
Extreme is an aggressive variation of the Classic mode, configured to achieve maximum gain before feedback by completely attenuating closed channels. Only open channels add to the system levels and ambient sound.
Extreme mode is designed for sound reinforcement applications.
Gating Style:
Gain Scaling:
Off Attenuation:
Last Mic Lock On:
Full
Fixed
−110 dB
Disabled
-15 dB
-15 dB
-15 dB
1 Talker
Channel Gain in Extreme Mixer
2+ Talkers
-15 dB
Full gain is applied to the open channel. Closed channels are fully attenuated.
As additional channels open,
NOMA factor decreases the level of all channels.
Manual
Manual mode deactivates IntelliMix to allow the SCM820 to operate as a standard mixer. All Channel Status LEDs remain on in this mode to indicate there is no IntelliMix attenuation. Channel and mix equalization, output limiter and mix bus routing are still active in this setting.
Tip: Be careful when switching to Manual mode, as all microphones will gate open to full gain, which may result in feedback.
Custom
Custom mode allows IntelliMix parameters to be fine-tuned and tailored from the GUI. The mixer automatically switches to Custom once a parameter is changed in Classic, Extreme or Smooth mode. Theses configurations are saved to the device and will persist after the mixer is turned off and restarted. Custom configurations can also be saved as a file to a computer and loaded onto the device for quick recall.
10
IntelliMix Parameters
Gating Style
Determines the way gain is applied to open channels.
Full
Channels open at full gain (as adjusted by the NOMA factor).
Relative
Channels open at a gain level that varies with the input signal level— quieter signals receive less gain than loud signals. As the input signal level increases, more gain is applied to the channel.
Gain Scaling
Determines off attenuation and its effect on the total system gain.
Fixed
Off attenuation is a fixed amount. Total system gain varies with the number of open channels.
Adaptive
Off attenuation is adjusted to maintain a uniform system gain comparable to that of a single open channel.
Off Attenuation
The amount of attenuation applied to closed channels.
Last Mic Lock On
Avoids ambient dropout by keeping at least one channel open at all times.
The last channel opened remains open until another takes its place.
Number of Open Microphones Attenuation (NOMA)
System gain is attenuated as additional channels are opened in a mix. This is configured per doubling of open channels, adjustable from 1– 6 dB for each mix that has Gain Scaling set to Fixed.
Maximum Number of Open Microphones (Max NOM)
Restricts the number of microphones that can be open at a time in a mix.
This is adjustable from 1 ("filibuster mode") to maximum (unlimited).
Hold Time
Determines the minimum amount of time that a channel is gated open.
OUT mix a
+ mix b
Selecting the Mixer Mode
Press the Mix A or Mix B button on the mixer back panel to scroll through the five modes. From the IntelliMix tab of the GUI, you can select a preset or configure the IntelliMix as a Custom setting.
AUX IN
+
Mixes A and B have the same IntelliMix settings when the
SCM820 is to Single Mixer Operation (default).
IN IN IN IN IN
+ + + +
L R
Back Panel
+ + +
The mixer can be set to perform one or two automixes:
+
8 7 6 5 that sends the same audio to both Mix A and B outputs. Limiter
4 and master gain can still be set independently for both outputs.
• Dual Mixer: Two separate buses provide independent automixes for each mix output. In this setting, two entirely different mixes can result from the same set of inputs.
Enable dual mixer operation by pressing the Dual Mixer button on the back panel or from GUI > IntelliMix Tab.
Example Dual Mixer Applications:
• Set Mix A to Classic mode for sound reinforcement, and set Mix B to Smooth for a broadcast feed.
• Mix A to Classic mode for sound reinforcement, and Mix B for
Manual for recording.
• Route channels 1-4 to Mix A and 5-8 to Mix B to run independent automixes for two different locations from one device.
+
IN
+
+
IN
OUT mix a
AUX IN
L R +
IN
+ + mix b
+
IN
+
IN
+
IN
+ direct out
+ +
8 direct out
+
7 direct out direct out
3 2 operation, illuminating the LED
+
IN
+
6 direct out
1
A
INTELLIMIX
B manual
A
+
IN smooth classic
+
IN
B
+ extreme
+
5 direct out direct out
Selecting the Mix Mode
CHANNEL line
+0dB mic
IN
+
CH
+ mic
+46dB
+
A
INTELLIMIX
B manual
A smooth classic
B extreme custom
CHANNEL
CH line
+0dB mic
+30dB mic
+46dB secondary primary primary reset
3 direct out
2 direct out dual mixer auto link lockout lockout reset dual mixer auto link
00:0E:DD:AA:BB:CC
GUI
00:0E:DD:AA:BB:CC
Select Dual Mixer operation
Selecting the Mix Mode
11
Networking
Network Overview
For most installations, the SCM820 can connect to a computer either directly or though a network switch ("Link-Local" connections). Connect multiple mixers to a switch in a star configuration to ensure reliable networking (each unit connects directly to the switch).
In some cases, computer settings or programs may interfere with the network. The majority of these connection issues can be solved by using a
DHCP-enabled router*. Most routers include a DHCP server, while switches do not.
*Note: DHCP servers are not recommended for redundant network configurations. See Redundant Network Recommendations for more details.
Basic Networking Requirements
To network SCM820 mixers, ensure the setup meets the following requirements:
• Use shielded Cat5e cables (or higher)
• Cable runs limited to 100 m (328 ft.)
• Devices are on the same subnet
Network Best Practices
• Use gigabit ethernet devices
• Use only one DHCP server per network
• Turn off other network interfaces not used to connect to the mixer
(including WiFi)
• All mixers must have the same level of firmware revision installed
Typical Network Setups
IntelliMix® gain
1 low cut hi shelf meter
2 3 4 5 push to solo | hold to mute
6 7 8
AUX IN
L+R SUM
MASTER gain limiter
A B LIM
-18
-9
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
Single Mixer
The SCM820 can connect directly to a computer. (This setup may take a minute or longer to establish a connection between devices.)
IntelliMix®
1 gain low cut hi shelf meter
2 3 4 5 push to solo | hold to mute
6 7 8
IntelliMix®
1 gain low cut hi shelf meter
2 3 4 5 push to solo | hold to mute
6 7 8
IntelliMix®
1 gain low cut hi shelf meter
2 3 4 5 push to solo | hold to mute
6 7 8
IntelliMix® gain low cut hi shelf meter
1 2 3 4 5 push to solo | hold to mute
6 7 8
IntelliMix®
1 gain low cut hi shelf meter
2 3 4 5 push to solo | hold to mute
6 7 8
IntelliMix® gain low cut hi shelf meter
1 2 3 4 5 push to solo | hold to mute
6 7 8
AUX IN
MASTER gain limiter
A B LIM
-18
-24
-48 -36
-60 L+R SUM power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
MASTER gain limiter
A B LIM
-18
-24
-36
-48
-60 L+R SUM power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
MASTER gain limiter
A B LIM
-18
-24
-48 -36
-60 L+R SUM power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
MASTER gain limiter
A B LIM
-24
-36
-48
-60 L+R SUM power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
MASTER gain limiter
A B LIM
-18
-24
-36
-60 -48 L+R SUM power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
MASTER gain limiter
A B LIM
-24
-36
-48
-60 L+R SUM power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
Multiple Mixers
Connect multiple mixers together in a star configuration using a DHCPenabled router for the most reliable network setup.
Digital Audio Networking
Dante tm digital audio is carried over standard Ethernet and operates using standard Internet Protocols. Dante provides low latency, tight clock synchronization, and high Quality-of-Service (QoS) to provide reliable audio transport to a variety of Dante devices. Dante audio can coexist safely on the same network as IT and control data, or can be configured to use a dedicated network.
Data Types on the Network
The SCM820 transports two types of data over the network: Shure Control and Dante Audio and Controller. They are transported to/from the two network ports depending on the mixer's network settings.
Shure Control: The Shure Control carries data for the GUI operation, firmware updates and 3rd party control systems (AMX, Crestron). This network is supported by all SCM820 models.
Dante Audio and Controller: The Dante network carries both the digital audio and the control data for Dante Controller. This network is supported by Dante-enabled SCM820s.
Switch Recommendations for Dante Networking
In addition to the basic networking requirements, Dante audio networks should use a Gigabit network switch or router with the following features:
• Gigabit ports
• Quality of Service (QoS) with 4 queues
• Diffserv (DSCP) QoS, with strict priority
• Recommended: A managed switch to provide detailed information about the operation of each network link (port speed, error counters, bandwidth used)
12
Dante Network Interface
The Dante network card is a two-port interface that can be configured to enable the following applications: secondary primary
• Link mixers to expand the audio mix, enabling the addition of up to 12 mixers (96 channels).
• Protect the audio signal with a redundant audio network.
• Isolate Dante audio from the Shure Control network.
• Record audio to a computer without additional hardware.
• Maintain digital audio path to other Dante devices.
• Route an 8-channel automixing insert to another Dante device using a single shielded Cat5e cable.
• Daisy-chain up to four SCM820 mixers.
Network Modes
The Dante network interface can be configured to operate in one of three modes: Switched, Redundant Audio or Split. This setting determines the types of data that are transported from the Primary and Secondary ports.
Data Transport in each Mode
The following table displays the configuration of the Dante network ports in each Network Mode. Note: Always connect the Primary port to the network that is used for Shure Control.
Dante Port Configuration
Network Mode
Secondary
Port Function
Primary
Application
Redundant Audio Dante Redundant Audio
Split Dante Audio and Controller
Shure Control
Dante Audio and Controller
Shure Control
Dante Audio and Controller
Shure Control
Typical installations of star or daisy-chained networks.
Create a backup audio network.
Isolate Dante and Shure Control networks
Caution: Disconnect the equipment from the network prior to changing the network mode. This will avoid a network loop that will make the network unstable.
secondary primary secondary primary Selecting the Network Mode
1. Disconnect the mixer from the network.
2. Connect the Primary port of the mixer directly to a computer.
3. Go to the Network panel in the GUI:
Preferences
>
Network secondary secondary secondary primary primary primary
4. Select the Configuration mode. The mixer will reboot once the selection is confirmed.
2 3 4 5 6 7 8
AUX IN 5. Repeat for each mixer.
IntelliMix®
1 gain low cut hi shelf meter
IntelliMix® gain low cut hi shelf meter
1 2 3 4 push to solo | hold to mute
5 push to solo | hold to mute
6 7 8
L+R SUM
AUX IN
L+R SUM
MASTER A B LIM gain limiter
-18
-24
-48 -36
-60 power ethernet automix link dual mixer lockout
SCM820
HEADPHONE
MASTER gain limiter
A B LIM
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
IntelliMix®
1 gain low cut hi shelf meter
2 3 4 5 6 7 8
IntelliMix® gain low cut hi shelf meter
1
IntelliMix®
1 gain low cut hi shelf meter
IntelliMix®
1 gain low cut meter
2
2
2
3
3
3
4
4
4 push to solo | hold to mute
5 push to solo | hold to mute
5 push to solo | hold to mute
5 push to solo | hold to mute
6
6
6
7
7
7
8
8
8
L+R SUM
MASTER A B LIM gain limiter
-18
-24
-60 power ethernet network audio dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER gain limiter
A B LIM
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER A B LIM gain limiter
-18
-24
-48 -36
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER gain limiter
A B LIM
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
Network Configurations in Switched Mode (default)
Star Configuration (Recommended)
Connect multiple mixers to a router in a star configuration for the most reliable setup.
Daisy-Chain (up to 4)
Up to four SCM820-DAN mixers can network together by daisy-chain. This is only supported in Switched network mode
(default).
Direct to Computer
Connect the Primary port directly to a computer.
secondary secondary secondary secondary secondary
Star Configuration
(Recommended) primary primary primary primary primary secondary primary
IntelliMix® low cut hi shelf meter
1 2
IntelliMix® gain low cut hi shelf meter
1 2 3
3 4 5 push to solo | hold to mute
6
IntelliMix®
1 gain low cut
2 3
4 5 push to solo | hold to mute
6
4 5 push to solo | hold to mute
6
IntelliMix® gain low cut hi shelf meter
1 2 3
IntelliMix®
1 gain low cut
2 3
4 5 push to solo | hold to mute
6
4 5 push to solo | hold to mute
6
IntelliMix® gain low cut hi shelf meter
1 2 3 4 5 push to solo | hold to mute
6
7 8
7 8
7 8
7 8
7 8
7 8
AUX IN
L+R SUM
MASTER gain limiter
A B LIM
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER gain limiter
A B LIM
-18
-24
-48 -36
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER gain limiter
A B LIM
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER gain limiter
A B LIM
-18
-24
-36
-60 -48 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
MASTER
L+R SUM
A B LIM
-18
-36 -24
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER gain limiter
A B LIM
-18
-24
-36
-60 -48 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
Daisy-Chain secondary primary secondary primary secondary primary secondary primary
IntelliMix® gain low cut hi shelf meter
1 2 3 4 5 push to solo | hold to mute
6 7 8
IntelliMix® gain low cut hi shelf meter
1 2 3 4 5 push to solo | hold to mute
6 7 8
IntelliMix® gain low cut hi shelf meter
1 2 3 4 5 push to solo | hold to mute
6 7 8 gain low cut hi shelf meter
IntelliMix®
1 2 3 4 5 push to solo | hold to mute
6 7 8
AUX IN
L+R SUM
MASTER gain
A B LIM limiter
-18
-9
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER gain
A B LIM limiter
-18
-9
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER gain
A B LIM limiter
-18
-9
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER gain
A B limiter
-24
-36
-48
-60
LIM
-18
-9 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE secondary gain low cut hi shelf meter
IntelliMix®
1 2 3 4 5 push to solo | hold to mute
6 7 8 primary
AUX IN
L+R SUM
MASTER gain limiter
A B
LIM
-9
-18
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
Direct to Computer secondary primary
IntelliMix® gain low cut hi shelf
1 meter
2 3 4 5 push to solo | hold to mute
6 7 8
AUX IN
L+R SUM
MASTER gain limiter
A B LIM
-9
-18
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
Warning: Do Not Make a Network Loop
Avoid the following setups that will render the network unusable: secondary primary
Do not connect the primary to the secondary port of the same device.
IntelliMix®
1 gain low cut hi shelf meter
2 3 4 5 push to solo | hold to mute
6 7 8 secondary primary
AUX IN
L+R SUM
MASTER gain
A B LIM limiter
-18
-9
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
Do not connect the two ports to the same switch.
secondary primary
IntelliMix® gain low cut hi shelf meter
1
IntelliMix® gain low cut hi shelf meter
1
2
2
3 4 5 push to solo | hold to mute
6
3 secondary
4 5 push to solo | hold to mute
6 primary
7
7
IntelliMix® gain low cut hi shelf meter
1 2
IntelliMix®
1 gain low cut hi shelf meter
2
3 4 5 6 7
3 push to solo | hold to mute secondary
4 5 6 primary
7 push to solo | hold to mute
8
8
8
8
AUX IN
L+R SUM
MASTER gain limiter
A B
LIM
-18
-9
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER gain limiter
A B
LIM
-9
-18
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER gain limiter
A B LIM
-9
-18
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER gain
A B LIM limiter
-9
-18
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE secondary primary
Do not connect mixers together in a loop.
13
Redundant and Split Networks
The Primary and Secondary ports require dedicated network switches in
Redundant Audio and Split modes.
Configuring a 100 Mbps Dante network
Gigabit equipment is strongly recommended for Dante network. If this is not possible, configure the 100 Mbps network with the following guidelines:
• Ensure the router has QoS enabled
• Latency settings are set to at least 1 ms
Caution: Do not form Link groups on a 100Mbps network, as this will cause increased traffic and will exceed the network bandwidth.
Disable DHCP
IntelliMix®
1 gain low cut hi shelf meter secondary
2 primary
3
IntelliMix® gain low cut hi shelf
1 meter secondary
IntelliMix® gain low cut
1 hi shelf meter secondary
IntelliMix® gain low cut
1 hi shelf meter
2 primary
2 primary
2
3
3
3 secondary primary
4 5 push to solo | hold to mute
6
4 5 push to solo | hold to mute
6
4 5 push to solo | hold to mute
6
4 5 push to solo | hold to mute
6
7
7
7
7
8
8
8
8
AUX IN
L+R SUM
MASTER A B gain limiter
LIM
0
A
-9
-18
-24
-36
-48
-60
B power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER gain limiter
A B LIM
0
A B
-9
-18
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER gain
A B limiter
LIM
A B
-9
0
-18
-24
-36
-48
-60 power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
AUX IN
L+R SUM
MASTER A B gain limiter
LIM
A
0
-9
-18
-24
-36
-48
-60
B power ethernet network audio automix link dual mixer lockout
SCM820
HEADPHONE
Isolated Networks for Each Port in
Redundancy and Split Modes
Redundant Network Recommendations
For the most reliable Redundant network, it is recommended to set up both networks without a DHCP server. Connect each unit to a network switch without DHCP or to a router with DHCP disabled.
If it is not possible to disable the DHCP server, configure the mixer to a static IP address from the GUI (
GUI
>
Preferences tab
>
IP Mode
>
Manual
).
Note: Use caution when operating a Link Group in a Redundant network. If a Link Group goes down, there will be temporary audio loss
on both ports while the group reconfigures.
Setting Latency
Latency is the amount of time for a signal to travel across the system to the outputs of a device. To account for variances in latency time between devices and channels, Dante has a predetermined selection of latency settings. When the same setting is selected, it ensures that all Dante devices on the network are in sync.
The latency setting for Dante devices should be set according to the number of switches in the network. The SCM820 network card has an internal switch chip and counts as a switch. For example, one SCM820 connected to an external switch equals two switches.
Go to
GUI
>
Preferences Tab
to change the setting.
Latency Recommendations
Latency Setting
0.25 ms
0.5 ms (default)
1 ms
2 ms
Maximum Number of Switches
1 Gbps Network* 100 Mbps Network
3
5
10
10+
2
5
-
-
*Strongly Recommended
Dante Software by Audinate
Audinate software provides additional function and control of the Dante digital audio network. Visit Audinate's website at www.audinate.com for software installation instructions, additional digital audio networking capabilities and troubleshooting help.
Dante Virtual Soundcard
Dante Virtual Soundcard (DVS) software turns a computer into a Danteenabled device, allowing digital audio traffic to be transmitted and received using the standard Ethernet port.
On Windows, DVS can select Steinberg’s ASIO audio interface or Windows
Driver Model (WDM). On Mac OSX, the DVS uses the standard Core Audio interface.
Dante Controller
Dante Controller (DC) is a free software program by Audinate that is used to configure and manage a network of Dante devices. Use it to route channels between Dante-enabled devices and to monitor the status of the device, clock, and network.
For proper functionality with the SCM820, use Dante Controller version
3.4.0.0 or higher. Go to Audinate's website for download and installation instructions.
14
SCM820
SCM820-DAN
SCM820-DB25
SCM820-DAN-DB25
OUT mix a
AUX IN
L R
+
IN
+
+ mix b mix b
+ direct out
OUT mix a
AUX IN
L R +
IN
+ direct out
MIX A
+
IN
+
8 direct out
+
IN
+
8 direct out
MIX OUTPUTS
MIX OUTPUTS
MIX B
+
IN
+
7 direct out
+
IN
+
7 direct out
L +R
SUM
L +R
SUM
AUX IN
AUX IN
+
IN
+
6 direct out
+
IN
+
6 direct out
+
IN
+
5 direct out
+
IN
+
5 direct out
INPUTS 1-8
INPUTS 1-8
Application Examples
4
4
+
IN
+ direct out
+
IN
+ direct out
3
Creating a Link Group
If additional channels are needed, multiple mixers can link together to create a larger automatic mix. To form a link, Dante-enabled mixers are connected to a gigabit network and assigned to a link group. This enables up to 12 mixers (96 channels) to contribute to the same mix from anywhere on the network.
+
+
IN
Mixers in the same link group operate under shared IntelliMix settings.
These settings are defined by the first mixer to join the group. When mixers are added, their IntelliMix and network settings are reconfigured to match the group's settings. IntelliMix settings can then be changed from any mixer, automatically updating the rest of the group.
+
A B manual
A
CHANNEL line
+0dB
Setting up a Link Group
2 1 smooth classic
B CH mic
+30dB mic
+46dB
+ Link Groups are managed from the Link Group tab of the GUI. Once a mixer joins a group, its front panel Network Audio and Automix Link LEDs will lockout illuminate green. Up to 12 mixers can join a group at a time.
direct out direct out dual mixer
Ensure the Link Group setup meets the following requirements: reset
+
IN
• Use SCM820 mixers with the Dante network card (SCM820-DAN or
SCM820-DAN-DB25)
• Devices must be on the same subnet
• Use Gigabit (or higher) network switches to connect the devices. 100 Mb networks are not supported.
• Ensure the switches have at least 300 Mbps of available bandwidth for each device. Devices in a Link Group use more network bandwidth than
Stand Alone devices.
A
INTELLIMIX
B manual smooth
A
CHANNEL line
+0dB mic
+30dB classic
B CH mic
+46dB extreme secondary primary custom phm 48 VDC dual mixer auto link 3
SCM820-DAN
2 direct out
1
Select the auto link
button on the mixer back panel. It automatically links to
IN IN IN IN IN IN IN IN CHANNEL
OUT AUX IN
A
INTELLIMIX
B manual mix a
L R + + + + + + + +
A smooth mic
+30dB classic
B CH
+ + + + + + + + + extreme custom phm 48 VDC lockout reset
8 7 6 5 4 3 2 1 dual mixer auto link mix b direct out direct out direct out direct out direct out direct out direct out direct out
Note: Only the first 12 mixers that enable Auto-Link will join the group. If the group is full and an additional mixer attempts to enable Auto Link, it
OUT mix a
+
AUX IN
L R
+
IN
+
+
IN
+
+
IN
+
+
IN
+
+
IN
+
IN will remain as a Stand-Alone device.
+ +
+
IN
+
IN
A manual smooth classic
A
B
CHANNEL
CH line
+0dB mic
+30dB mic
+46dB
+ + extreme custom secondary primary phm 48 VDC lockout reset
8 7 6 5 4 3 2 1 dual mixer auto link mix b direct out direct out direct out direct out direct out direct out direct out direct out reset
SCM820-DB25
DIRECT OUTPUTS 1-8
SCM820-DAN-DB25
MIX A
MIX OUTPUTS
MIX B
SUM
A
INTELLIMIX
B manual
A smooth classic extreme custom
B
INPUTS 1-8 DIRECT OUTPUTS 1-8 dual mixer
CHANNEL line
+0dB
CH mic
+30dB mic
+46dB
A
INTELLIMIX
B phm 48 VDC
A
CHANNEL smooth mic
+30dB classic
B CH custom dual mixer phm 48 VDC auto link secondary lockout primary reset lockout reset
Setting Mix Outputs in a Link Group
The Local/Global setting determines whether each linked SCM820 Mix
Output contains only its own program output, or that of all linked mixers. Go to the Output tab of the GUI to select the mix output.
Note: The Master level control is independent of the Local/Global setting. The output level and limiter setting of each mixer is affected only by its own Master control.
Global (default): All linked channels appear at the mixer outputs. This is the default setting for the mixer.
Local: Only its own eight input channels appear at the mixer's Mix Outputs.
Aux Channel
The aux channel can be set to Local or Global from GUI > Inputs Tab.
Local Aux keeps the Aux signal from appearing on the mix output of other networked boxes
Integrating with Other Systems
DFR or External Equalizer
When using DFR channels or setting up a sound system an external processor/equalizer, begin by setting the SCM820 to Manual. This activates
(gates open) all channels, so every possible feedback path is open.
After equalizing the sound system and "ringing out" the room with the feedback controller, set the mixer back to an IntelliMix mode.
Shure ULX-D Digital Wireless System
Shure ULX-D ™ Digital Wireless offers uncompromising audio clarity and extremely efficient RF performance with rugged, intelligent, encryptionenabled hardware. The SCM820-DAN can provide automixing for the Dual or Quad ULX-D receiver by connecting to the Dante digital audio network.
As Channel Inserts
IntelliMix can be used as a processing insert on an analog console or over the digital audio network. Be sure to set the console inserts to post-fader.
If this is not available, be sure to mute audio at the SCM820 in order to remove the signal from the automix.
Analog Insert
1. Connect the send from the mixer insert to the input of the SCM820.
2. Set the channel input to Line level (+0).
3. Connect return from the mixer insert to the direct output of the
SCM820.
4. Set the direct output to IntelliMix NOMA.
Dante Insert
1. Open Dante Controller software.
2. Route the console sends to the SCM820 inputs.
3. Route the SCM820 direct outputs to the console returns.
4. Set the channel Source to Network from the Inputs tab of the GUI.
5. Set the direct output to IntelliMix NOMA on the Outputs tab.
Custom Groups
To configure specific Link Groups, create a custom group in the GUI.
Custom groups are helpful for managing multiple Link Groups across multiple mixers on the same network. To set up a Custom Group:
1. Open the Link Group tab of the GUI.
2. Click the New Group button create a group.
manual
A line
+0dB
3. Name the group.
DIRECT OUTPUTS 1-8 smooth
4. Drag and drop mixers to the group.
B CH mic
+30dB mic
+46dB extreme secondary custom phm 48 VDC lockout
SCM820-1
SCM820-2
SCM820-3
SCM820-4
SCM820-5
SCM820-6 dual mixer
Group 1
SCM820
SCM820-1
SCM820-3
SCM820-4
SCM820-5
SCM820-6 auto link primary reset
Configuring for Use with a Choir
Use the SCM820 to manage a group of microphones that are providing sound reinforcement for a choir.
1. Connect microphones to the mixer.
2. Set the appropriate level for the microphones.
3. Open the IntelliMix tab of the GUI.
4. Select Classic IntelliMix mode.
5. Engage the Gate Group box for each choir microphone to ensure they gate open and closed at the same time. This will change the IntelliMix to
Custom mode.
6. Increase the Hold Time for the Mix output to the maximum setting of 1500 ms.
Tip: If unnatural gating occurs during sustained notes, disable the Noise
Adaptive Threshold (NAT) and manually set a gate threshold.
15
Internet Calling
Dante-enabled mixers integrate software applications such as Skype tm ,
Lync tm , Voice. This enables multiple microphones to participate in a teleconferencing event.
1. Reference the Installation section to properly connect and setup microphones to the mixer back panel.
2. Open the IntelliMix tab of the GUI.
3. Select Dual Mixer operation.
4. In the GUI, route channels 1 - 8 to Mix A only (deselect routing to Mix B).
5. In the Inputs tab, set the Aux channel to Network input source.
6. Route the Aux channel to Mix B only.
7. Open Dante Virtual Soundcard and turn it on.
8. Open Dante Controller (DC) software.
9. In DC, route the SCM820 tx channel 'Mix A' to computer rx channel 1.
10. In DC, route computer tx channels 1 and 2 to SCM820 rx channels Aux
L and R.
11. Connect Mix B analog output to a speaker or output device.
12. Open the computer's settings and select Dante as the input and output soundcard.
Trademarks: Trademarks are the property of their respective owners.
Logic
The logic functions of the SCM820 expand the mixer's range of installation and control options. These functions can be hardwired or configured in the
GUI.
The following hardware logic functions are available for each channel:
Gate Out
Follows channel gating and goes to logic "low" (sinks current) when microphone is gated on. 500 mA of current sinking ability is provided.
Mute In
Applying logic "low" (from GATE OUT or a switch closure to logic ground) gates channel off (channel output is fully attenuated).
Override In
Applying logic "low" (from GATE OUT or a switch closure to logic ground) forces channel on. When both Mute and Override are activated, Mute takes precedence.
Logic Ground
Logic ground is distinct from the SCM820 audio ground. Make all logic ground connections to this pin, including power supply ground of external logic circuitry. To avoid switch clicks, do not connect logic ground to audio, chassis or rack grounds.
Suggested Logic Application
This section contains suggestions on the uses of the SCM820's logic capabilities. For additional suggestions and solutions to installation problems, contact Shure's Systems Support.
Cough Button
The talker can turn off his or her microphone during coughing or private conversations by installing an SPST pushbutton switch between the MUTE
IN and Logic Ground pins for each channel to be modified. When a channel is muted, no audio is passed.
Set the mute control to post-IntelliMix setting (
GUI
>
IntelliMix Panel
>
Mute Control
) to ensure that unwanted sounds do not gate on other microphones.
Chairperson-Controlled Muting
The chairperson can, by activating a switch, silence all other microphones and be heard without interruption.
1. Set the desired channel to Chairperson Mute to manual (
GUI
>
IntelliMix Panel
>
Chairperson
>
Mute
).
2. Connect the switch to the Override In logic connection for the chairperson's microphone.
An alternative to a switch is to set the Chairperson Mute to Auto. In this setting, when the chairperson's microphone activates, all other microphones mute automatically.
Remote Channel-Open Indicators
Remote indicators can be used to indicate when a talker's microphone is on. Connect the LEDs and a 5-volt supply to the GATE OUT pin. To avoid switching clicks in the audio output, do not ground the power supply negative terminal in the audio system or rack ground.
Important: If a single cable is used for the microphone audio signal and the
LED dc power, separate shielded pairs must be used. Failure to carry the
DC power on a shielded pair may result in audible clicking due to capacitive coupling between the DC power lines and microphone lines.
Disabling the Gating Function (Always On)
Select Always On for the channel(s) that should remain open (
GUI
>
IntelliMix Panel
>
Always On
.
Inhibiting Gating for Unwanted Sounds
The MaxBus operating principle ensures that the mixer will activate only one microphone per sound source. Muting a microphone channel prevents its audio from appearing at the mixer's output. However, the muted channel set to Post-IntelliMix still communicates with other mic channels via MaxBus.
A sound source picked up by a muted microphone will not activate other microphones.
Sound sources that may cause unwanted microphone channel activation include:
• A noisy fax machine or printer
• A squeaky door
• An intercom system
• A teleconferencing loudspeaker
The SCM820 can prevent these and similar sounds from activating microphones by taking the following steps.
1. Place one microphone near the unwanted sound source. Connect that microphone's signal to a channel input.
2. Mute the channel.
3. Set the Mute Control to Post-IntelliMix (
GUI
>
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Mute Control
).
4. Adjust that channel's gain control just to the level where other microphones in the system do not activate for the unwanted sound. If the channel gain is set too high, other system microphones will be difficult to activate for desired sounds. If set too low, unwanted sounds will continue to activate other microphones.
Loudspeaker Muting
Some applications require a loudspeaker to be placed near each talker to provide audio reinforcement, or to permit telephone conversation or conference monitoring. Each loudspeaker can cause feedback unless it is automatically switched off when the talker near it speaks. To provide this function, connect the GATE OUT terminal of each channel to a separate loudspeaker muting relay.
NOTE: A diode across each relay coil is required to suppress inductive voltage spikes which may damage the SCM820.
An alternative to creating a circuit is a Logic Controlled Relay, such as the
Radio Design Labs (RDL) ST-LCR1.
“Filibuster” Mode
In normal operation, when several people talk, each microphone gates on so that no speech is missed. In “filibuster” action, a microphone that is gated on prevents other microphones from gating on. Once a microphone has gated on, other microphones cannot gate on until the talker has paused long enough for that microphone to gate off. Thus the person talking has the floor and cannot be interrupted.
Set the maximum number of open microphones to 1 (
GUI
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IntelliMix Panel
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Mix A/B
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Max NOM
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Digital Feedback Reduction (DFR)
DFR uses Shure’s patented Adaptive Notch Filter algorithm to discriminate between feedback and non-feedback sounds. It automatically detects feedback and deploys narrow-band notch filters at the feedback frequencies. DFR filters are narrow enough to prevent any coloration of the audio program.
No sound system (the combination of microphones, mixing, signal processing, power amplifiers, loudspeakers and room acoustics) produces an absolutely flat response. When the level of a sound system is increased, the frequencies at which peaks occur will be the first to exceed the threshold of feedback. The DFR attenuates these frequencies, flattening the response of the sound system and enabling operation at a higher overall level.
DFR is available for the SCM820 on firmware versions 1.1.0 and higher. For a unit running an earlier firmware version, use the Shure
Update Utility application to update the mixer to a new firmware. The application is available from www.shure.com/software.
Function
Use DFR as the initial processor on any channel that receives signal from a live microphone where feedback is problematic. When DFR detects feedback, it inserts a shallow, narrow filter into the audio path to reduce gain at the feedback frequency. This filter is called a notch filter, due to the narrow section of the frequency spectrum it affects. The notch automatically deepens if feedback continues on that frequency.
Basic DFR Setup
Digital Feedback Reducer will not enable you to increase system gain beyond the physical limits of the sound system. In most cases, you reach a point of diminishing returns after five to eight notch filters are set. This is because there are usually only a few dominant peaks in the response of the system. In most cases, you can expect a 6 dB to 9 dB improvement in gain-before-feedback by using the DFR. When you are ringing out the system and notice that many frequencies feedback simultaneously, you have reached the point of diminishing returns. If at this point the system still has insufficient gain before feedback, other changes must be made to the sound system, such as changing the placement of the microphones and/or loudspeakers.
There are two basic ways in which to set-up the DFR to reduce feedback; the Ring-Out Method and the Insurance Policy Method:
• Ring Out Method - With this method, you use the DFR as a preemptive measure against feedback for input channels that operate near the feedback point and need an extra margin of stability. Using this method, you raise the channel’s gain beyond its normal setting to deliberately make the system feed back. The DFR will then set the proper filters. Then, when you reduce the input gain to an appropriate level, the system is stable and usable.
• Insurance Policy Method - With this method, you use the DFR as added insurance against unexpected feedback in an otherwise stable system. Simply place the DFR processor in the signal path, without defining any settings. This method is used for systems which already have sufficient gain-before-feedback, but need protection from occasional feedback occurrences due to non-stationary microphones or user-adjustable gain controls.
To ring out the system:
1. Remove any active filters by clicking the Clear All button.
2. Place microphones at their intended locations.
3. Set the mixer to Manual to open all mics.
4. Slowly raise the gain of the sound system while talking or clapping into the microphones.
5. Assign the DFR to the channel that begins to feed back. If multiple microphones feed back in the same frequency, assign the DFR to the mix bus.
6. The DFR processor will deploy notch filters to attenuate the feedback frequencies.
7. Once the system has stopped feeding back, you can continue by further raising the level and repeating the process for additional frequencies.
Typically you can raise the gain 3 dB to 9 dB above the level at which feedback first occurred.
8. Lock the deployed filters so they are fixed. The remaining Unlocked
(Dynamic) filters will deploy as needed when the system is in use.
Note: Depending on the setup of the sounds system, the main PA signal may be separate from the monitor mix signal. Each feedback path should include a DFR for the maximum gain before feedback.
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Assigning DFR
Two DFR blocks are assignable to any channel input or mix output. When using two or less microphones, assign the DFR to those channels to prevent feedback from routing to the mix bus. Additionally, if a microphone is designated for a chairperson or host, DFR should be applied to that channel to ensure that remains stable and does not feed back.
Apply DFR to a mix bus when using multiple non-stationary microphones or when trouble frequencies are feeding back simultaneously in multiple microphone channels.
Filter Types
By default, the DFR processor filters are unlocked to dynamically adjust as feedback frequencies are detected. However, you can specify how many of the total number of notch filters will remain fixed (locked). Use a greater number of locked (fixed) filters on input channels for stationary microphones. In this instance, the room acoustics define the dominant feedback frequencies, which do not change appreciably. Use a greater number of the dynamic (unlocked) filters on input channels for wireless or handheld microphones. In this situation, feedback frequencies change drastically as the microphone user wanders the room or sound stage.
Both fixed and dynamic filters will automatically deepen as additional feedback is detected.
• Locked (Fixed): Once set, the frequency of a fixed filter will not change until it has been cleared or a new frequency manually entered.
• Unlocked (Dynamic): Frequencies are automatically assigned by the DFR as feedback is detected. Once a filter is deployed, it remains at that frequency until all filters are used. At that time, the DFR redeploys each dynamic filter at the newly detected frequency, in the order of oldest dynamic filter to newest.
Filter Width
The DFR offers two width options for notch filters. By default, filters in the DFR are deployed as High Q filters. As a high Q filter gets deeper its Q increases up to 101
(1/70th of an octave). You can also set filters to deploy at Low Q. Low Q filters affect a slightly wider range of frequencies by maintaining a Q of 58 (1/40th of an octave) as they deepen. To change the setting for an existing filter, select the Q-Width drop-down menu in the filter row.
New Filter Q: This setting determines the Q width for new Unlocked (Dynamic) frequencies as deployed by DFR.
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Navigation Bar
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GUI Description
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1) Tabs
The GUI is separated into six tabs that are used for different functions:
• Input: Setup and management of input channels 1-8 and Aux
• IntelliMix: Select Mix mode and load/save Customize IntelliMix settings
• DFR: Set up and monitor Shure Digital Feedback Reducer (DFR) for up to two channels
• Output: Assign the direct output and manage Mix A and Mix B outputs
• Link Group: Manage the Link Group status of devices
• Preferences: Configure network settings, set the device password, assign metering type, and engage hardware lockout.
2) Device List
Displays the name of the mixer as set in the Preferences tab. Click the drop-down bar and select a device to open its GUI in a new window or tab.
3) Identify
When clicked, this commands the mixer’s LEDs to flash for easy identification.
4) Log Off
When a password is set, this button logs off of the device and returns the user to the Log On page. This button does not appear when there is no password
(default).
5) Shure Web Link
Links to the Shure website at www.shure.com.
6) Language
Sets the language of the GUI. This setting is saved to the computer’s cookies.
7) Help
Opens the Help file for the GUI.
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Input Tab
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1) Channel Name
Channel names can be customized with up to 31 any characters in length except ‘=’,’.’ or
‘@’.
2) Source
Sets the audio input to one of two sources:
• Analog (default): Audio is from a microphone or line-level audio source connected to a channel input on the mixer back panel.
• Network: Audio is from the Dante digital audio network. Dante Controller software is required to properly route audio to the channel inputs.
3) Input Gain Level
Selects the analog input gain level for each channel.
• Mic (+46 dB): For less sensitive microphones such as dynamics.
• Mic (+26 dB): For loud talkers or sensitive microphones such as condensers.
• Line (+0dB): For line-level sources such as mixer inserts.
Note: Gain is disabled when the audio source is set to Network.
4) Phantom Power (+48V)
When selected, the button illuminates green to indicate 48 V phantom power is supplied to the microphone. Use this setting for condenser microphones.
Note: Disabled when Input Gain Level is set to Line (+0dB) or Network is selected for the audio source .
5) Low Cut Button
Ideal for attenuating low-frequency vibration caused by table vibrations or air-conditioning rumble. Adjust the frequency of the 12 dB/ octave filter from 25 - 320 Hz.
• Green= enabled
• Gray= disabled
6) High Shelf Button
For tempering sibilant speech or enhancing the sound of off-axis microphones. Use this to boost or cut the signal by 12 dB at 5 kHz.
• Green= enabled
• Gray= disabled
7) DFR Enable/Disable Button
When Digital Feedback Reducer (DFR) is assigned from the DFR tab, an enable/disable button appears in that channel strip.
• Green= enabled
• Gray= disabled
8) Channel On Indicators
The two indicators illuminate green when the channel is open to that mix bus (Mix A or
Mix B). When set to Dual Mixer, the A and B indicators function separately for each mix.
9) Clip Indicator
Illuminates when the signal is clipping the input preamp. The light will stay lit as a warning for 2 seconds. Select a lower Input
Gain Level to avoid clipping.
10) Input Meter
Displays signal level information. The meter is customizable in the Preferences tab to monitor the following options:
• Realtime monitoring of the input signal level
(default) or IntelliMix Gain attenuation.
• Pre- or post-fader Input signal level.
• VU + Peak (default), Peak, or VU metering of input signal level_Ref86959235.
11) Channel Fader and Gain Value
Adjusts the channel volume from -110 dB to
+18 dB.
12) Group (Fader and Mute)
Each channel can join a fader or mute group, which enable the adjustment of several channels at once. There is one Fader and one
Mute group for each Link Group.
13) Mute Button
Mutes the audio for that channel. A muted channel still can still be soloed to the headphones for monitoring. Channel Mute
Control can be set to one of two places from the IntelliMix tab:
• Pre-IntelliMix: Audio is muted before
MaxBus or IntelliMix decisions.
• Post-IntelliMix: Audio is muted after contributing to IntelliMix and Maxbus decisions.
14) Solo Button
Solos the selected channel to the headphone jack for monitoring.
15) Aux Routing
Routes the aux channel to the selected mix output. The aux channel routes without automixing to the mix outputs.
16) Aux Link Mode
Defines the aux channel routing when the device is in a Link Group:
• Global (default): Aux audio appears at the outputs of all linked mixers.
• Local: Aux audio appears only at that mixer’s output.
17) Copy Channel
Copies the selected channel’s Input settings to the device or to the entire Link Group.
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Intellimix Tab
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Mixer Settings
1) Mixer Type
The SCM820 can be set to operate as a single or dual mixer:
• Single Mixer: Channels are routed to a single mix bus that sends the same audio to both Mix A and B outputs. This allows the same program to be sent to different rooms or recording applications. The output gain, parametric equalizer and limiter can be set separately for each mix.
• Dual Mixer: Two separate buses provide independent automixes for each mix output. This allows two entirely different mixes to result from the same set of inputs or enables the SCM820 to function as two smaller independent mixers. This is useful when the mixer is being used for two applications. For example, set Mix A to Classic mode for sound reinforcement, and set Mix B to Smooth for a broadcast feed. As a dual mixer, each channel can route to Mix A, Mix B, both or neither mixes.
2) Mix Modes
The Mix Mode sets the IntelliMix configuration to determine the way the channels are mixed to the master outputs. When an adjustment is made to any IntelliMix preset, the mode automatically changes to Custom. See
Mixer Modes section for configuration details of each preset.
Press the mode button to highlight which channels are routed to that mix.
The color of the box around a channel correlates to the IntelliMix settings of the mix output. To view the other mix’s settings, click on the mode for that mix.
Note: When set to Single Mixer operation, Mixes A and B are the same.
3) Save
Saves current Custom IntelliMix settings as a file to your computer.
4) Load
Uploads a saved Custom IntelliMix settings file.
Channel Strip
5) Channel Name
Displays the channel name as defined in the Inputs Tab.
6) Routing
Routes the channel to the Mix A or Mix B output. The routing options depend on the Mixer Type:
• Single Mixer Type: the channel can route to both or neither mixes.
• Dual Mixer Type: the channel can route to Mix A, Mix B, both, or neither mixes.
7) Gating Logic
When the mixer is set to Dual Mixer operation, this setting determines whether Mix A or Mix B controls the hardware functions (IntelliMix Direct
Output), indicators (Channel Status LEDs) and channel Logic pins.
8) Always On
The Always On setting forces a channel to stay open continuously in the mix.
Note: A channel that is set to Always On still contributes to and is affected by the IntelliMix. For example, NOMA still applies to Always On channels.
9) NAT (Noise Adaptive Threshold)
Select to engage the NAT, which continuously adjusts the gate threshold for opening a channel. NAT is a core IntelliMix operating principle.
10) Offset
Sets the difference in dBs between the noise floor (determined by NAT) and a signal level, above which will open a channel.
11) Threshold
When NAT is deactivated, this manually determines the noise level above which a channel will gate open.
12) Chairperson
Override: When selected, it allows this channel to gate open regardless of
NOM setting (number of open microphones).
Mute: When selected, all other channels mute when this channel gates open. There are two types of Chairperson Mute:
• Auto: Other channels automatically mute when the selected channel is gated open.
• Manual: A Logic-wired button connected to the Override In Logic pin controls the mute function applied to all other channels.
13) Gate Group
When any channel from the group is gated open, the rest of the group automatically gates open. There is one Gate Group for each Link Group.
In Dual Mix mode, there is one gate group per Mix for each Link Group.
This is disabled when the Gating Style is set to Relative.
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14) Mute Control
Determines the location of a channel mute in the mixer’s signal path.
• Pre-IntelliMix: the signal mutes prior to the Intellimix bus.
• Post-IntelliMix: the signal goes to the mix bus and is muted after it contributes to IntelliMix decisions (such as MaxBus and NOM).
Mix Outputs
15) Mix Name
Displays Mix Output name, set from the Mix Output tab.
16) Gating Style
Determines the way gain is applied to open channels.
• Full: Channels open at full gain, adjusted to the NOMA factor.
• Relative: Channels open at a gain level that varies with the input signal level—quieter signals receive less gain than loud signals.Note: Gate
Group and Hold Time are disabled in this setting.
17) Gain Scaling
Determines how total system gain is managed. There are two types of
Gain Scaling:
• Fixed: Off attenuation is a fixed amount. Total system gain varies with the number of open channels.
• Adaptive: Off attenuation is adjusted to maintain a uniform system gain comparable to that of a single open channel. Note: Off Attenuation, Last
Mic Lock-On, and NOMA are disabled in this setting.
18) Off Attenuation
Sets the amount of attenuation applied to closed channels. This is disabled when the Gain Scaling is set to Adaptive.
19) Hold Time
In Full gating style, this determines how long a channel remains open after the signal level drops below the gate threshold. This is disabled when the Gating Style is set to Relative.
20) NOMA (Number of Open Microphone Attenuation)
NOMA attenuates the system gain as additional channels open in a mix. This controls system levels and reduces feedback. The parameter setting applies per doubling of microphones. This is disabled when the
Gain Scaling is set to Adaptive.
21) MAX NOM (Number of Open Microphones)
Limits the maximum number of microphones that can be open in a mix at the same time. When set to Max, there is no limit.
Tip: Set the MAX NOM to 1 for “Filibuster Mode” (one talker at a time).
22) LMLO (Last Mic Lock On)
Avoids ambient dropout by keeping at least one channel open at all times (the last opened channel).This is disabled when the Gain Scaling is set to Adaptive.
23) Copy Channel
Copies the selected channel’s IntelliMix settings to the device or to the entire Link Group.
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Digital Feedback Reduction (DFR) Tab
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1) Enable/Disable Button
Click this button to enable or disable the
DFR notch filtering. It automatically turns on when DFR is assigned to a channel. When disabled, the DFR filters are turned off.
• Green= enabled
• Gray= disabled
2) Channel Assignment
Assign the DFR block to an input channel or mix bus.
3) # of Filters
Adjust the maximum number of filters from 1 to 16 (default).
4) Response Graph
This curve is a graphical representation of the processor’s active notch filters (highlighted in yellow). The frequency of the currently selected filter is indicated by a red line.
5) Feedback Filters
Each filter row displays the filter type, frequency, depth and Q width. Between 1 and
16 filters are available for each DFR channel.
When a row is selected, a red line appears on the response curve at that frequency.
6) Filter Type
This button designates the filter type so that its frequency either dynamically adjusts or remains fixed. In both types, DFR automatically adjusts the filter depth.
• Unlocked (Dynamic): the frequency is adjusted automatically
• Locked (Fixed): the frequency is fixed and will not change automatically
7) Frequency
This indicates the frequency of the selected filter. You can change the value by scrolling on the arrow buttons or by entering a specific value. The frequency range is from 25Hz to
20kHz. The value is blank (------) until the filter is deployed by the DFR or entered manually.
8) Depth
This indicates the gain reduction of the selected filter. The range of available gain values is between 0 db and -18 dB in 0.5 dB increments, with a default setting of 0 dB.
9) Q-Width
This indicates the bandwidth type of the selected filter. Select High Q (default) or Low
Q from the drop-down menu.
• High Q: 1/70th octave (Q=101)
• Low Q: 1/40 octave (Q=58)
10) New Filter Q
This selection designates the width of each new filter as it is deployed by DFR.
11) Freeze
Click this button to prevent both the deployment of new filters and the automatic adjustment of existing filters. Freeze the DFR to keep it from deploying filters for program material that contains sounds that closely resemble feedback (such as guitar effects, synthesized tones, flute or pipe organ). The button appears lighted in blue when the freeze feature is enabled. During this time, filters remain manually adjustable.
12) Auto Clear
This feature automatically clears Unlocked
(Dynamic) filters and removes changes to the depth of Locked (Fixed) filters. Locked filter depth reverts to the level set when Auto Clear was enabled.
When enabled, Auto Clear occurs during each power cycle. Additionally, a repeating timeout can be defined to ensure that DFR filters clear regularly.
The Auto Clear timeout applies to each filter independently, and starts the moment it is deployed. The timer will restart after any change to a filter’s frequency, depth, or Q. The timer has a range of 1 minute to 100 hours.
13) Clear Filter Buttons
• Selected: Clears settings for the selected filter(s).
• Unlocked: Clears settings for all Unlocked
(Dynamic) filters.
• Clear All: Clears all settings in the DFR block and reverts all filters back to Unlocked
(Dynamic).
14) Load/Save
All DFR parameters can be saved as a file to a computer and loaded to quickly recall settings.
Note: DFR settings are included with SCM820 system settings that are saved from the
Preferences tab.
15) Channel Fader and Gain Value
Channel gain is adjustable from to the DFR tab for monitoring the notch filters when ringing out a sound system. Any adjustment made to the gain here is mirrored on the assigned channel strip.
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Output Tab
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Direct Output
1) Channel Name
Displays the channel name as defined in the Inputs Tab.
2) Direct Output Selection
The direct output can be routed from one of five stages in the signal path:
• Pre-EQ (default): After the Input Gain
• Post-EQ: After the EQ blocks
• Post-Fader: After the channel fader
• IntelliMix: After the IntelliMix gating decision
• IntelliMix NOMA: After IntelliMix gating and after NOMA is applied
3) Direct Output On Indicator
The two indicators the gating states that are used for the direct outputs.
4) Clip Indicator
Illuminates when the input signal overloads the digital-to-analog converter. The light will stay lit as a warning for 2 seconds.
5) Direct Output Meter
Displays the channel’s direct output signal level.
Master
6) Mix Output Name
Mix names can be customized with up to 31 any characters in length except ‘=’,’.’ or ‘@’.
7) PEQ (Parametric Equalizer)
Each mix output has an 8-band parametric EQ that is engaged by the check box. Press the button to open the PEQ window.
8 bands are editable from the PEQ, including a low and high shelf. Select the box to engage the band and edit the following parameter:
• Frequency: Sets the center frequency for each band from 25 - 20,0000
Hz.
• Width and Q: This setting adjusts the bandwidth of the EQ adjustment from very narrow (1/70 octave or 100.99Q) to very wide (4 octaves or
0.27 Q).
• Gain: Sets boost or cut of the EQ setting from -18 to +18 dB.
8) DFR Enable/Disable Button
When DFR is assigned from the DFR tab, an enable/disable button appears in that channel strip.
• Green= enabled
• Gray= disabled
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9) Lim (Limiter) Indicator
Illuminates to indicate that the signal has exceed the limiter threshold, engaging the limiter.
10) Clip Indicator
Illuminates when the signal has clipped the outputs, holding for two seconds.
11) Output Meter
Displays the output signal level.
12) Fader and Gain Value Box
Adjusts the mix volume from -110 dB to +18 dB.
13) Limiter Activation Box
Activates the limiter when selected.
14) Limiter Threshold
Set the limiter threshold from -2 to -50 dBFS for the mix outputs. The level is indicated by the blue triangle next to the meter.
15) Output Level
Selects the output level of the mix outputs. Set according to the input of the connecting equipment. There are three settings: Line (-0dB) (default),
Aux (-20dB), Mic (-46dB).
16) Group (Fader or Mute)
Adds the mix to the Fader or Mute group. Groups allow the adjustment of several mixes outputs at once. There is one Fader and one Mute group per Link Group.
17) Mute
Mutes the audio output for that mix.
18) Link Mode
Defines the audio content for the mix outputs when the device is in a Link
Group.
• Global (default): The mixer’s outputs contain audio from the entire Link
Group.
• Local: The mixer’s outputs contains only the audio from that mixer’s inputs.
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Link Group Tab
SCM820
SCM820-1
SCM820-2
SCM820-3
SCM820-4
SCM820-5
SCM820-6
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Group 1
SCM820
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1) All Devices List
Master list of all available SCM820 Dante units on the network.
• Drag and drop the devices to a Link Group or the Stand Alone Window.
• Select a device to view its location in either the Linked or Stand Alone device windows.
2) Linked Device Groups
Displays each Link Group along with the number of devices that comprise it. There is one Auto group that includes up to 12 mixers that have Auto Link enabled.
When a device is placed in a group, it will automatically configure the unit to the group’s settings.
3) Stand Alone Devices List
Displays all mixers that function independently of a link group.
4) New Group Button
Creates a new Link Group to the list.
5) Delete Group Button
Deletes an empty group from the Linked Device Group window. This is inactive if there are any mixers in the group.
6) Link Status Indicator
• Green: Link group is ready.
• Flashing Green: Link group is configuring.
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Preferences Tab
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Device
1) Device Name
Device names can be customized with up to 31 any characters in length except ‘=’,’.’ or ‘@’.
2) Push to Dante Name
Overwrites the device and channel names in Dante Controller (DC) software. Note: Use with caution, as this could break the routing configuration in DC and cause audio interruptions.
3) Dante Device Name
The name of the device in Dante Controller.
4) Device Serial Number
Unique identification of the mixer. Use the number to register the unit at shure.com.
5) Firmware
Displays the firmware version of the device.
6) Input Meter Mode
Determines if the channel meters are before (Pre-Fader) or after (Post-
Fader) the channel’s volume knob/fader.
7) Meter Type
Selects the information displayed on the channel input meters on the
Input tab:
• VU+Peak (default): Peaks display as a hash bar; average signal levels are displayed as a solid bar.
• VU: Displays average audio signals.
• Peak: Displays peak audio signals with a peak hold displayed as a hash bar.
8) Headphone Mode
Routes audio to the headphone output from one of two stages in the signal path:
• Pre Fader (default): Post EQ and pre-volume knob/fader.
• Post-Fader: Post EQ and post-volume knob/fader. This is post-limiter for the mix adjustments.
9) IntelliMix Metering
Changes the GUI Input meters to display IntelliMix attenuation applied in realtime, as displayed with an orange meter. Channels that gate open will display more gain than channels that are closed (attenuated) in the mix.
10) Disable Software Meters
When selected, this turns off all metering in the GUI. Disabling meters helps to reduce network traffic. (This does not affect the hardware metering.)
Hardware Lockout
11) Hardware Lockout
Disables hardware controls on the mixer. This can lockout the entire mixer or specific functions: all back panel, master controls, channel controls, and the lockout button on the mixer back panel.
12) Copy to Link Group
Copies Hardware Lockout settings to the entire Link group
Network
13) Configuration
Determines the routing of Shure Control and Dante Audio & Controller data from the two network ports. See Port Configuration for details.
Follow these steps to change the Configuration mode:
1. Disconnect the mixer from the network.
2. Connect the Primary port of the mixer directly to a computer.
3. Go to the Network panel in the GUI: Preferences > Network
4. Select the Configuration mode. The mixer will reboot once the selection is confirmed.
5. Repeat for each mixer.
Warning: Do not reconnect mixers to the network until the network settings are the same for all units.
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14) Interface
Click to view audio and control data routing for each interface.
15) IP Settings
Displays the network settings for each port:
• Auto: For automatic DHCP or Link-Local IP addresses
• Manual: For Static IP addresses
16) Network Speed
Indicates the speed of the network.
17) Dante Latency
The latency setting for Dante devices should be set according to the number of switches in the network. The SCM820 network card has an internal switch chip and counts as a switch. For example, one SCM820 connected to an external switch equals two switches.
See Latency section for more details.
Software
18) Default Language Selection
Determines the language of the GUI when it opens on a computer with no prior cookies.
19) Password
By default, no password is required to log on to the GUI. To add an
Administrator password for the GUI, follow these steps:
1. Enter password into the New Password field
2. Repeat for the Password (Confirm)
3. Select Apply to set the password.
Once a password is set, any user can log on as a Guest to view the
GUI without changing settings.
To clear a password and allow anyone full editing rights:
1. Log on to the GUI
2. Enter the current password into the Old Password text field.
3. Press the Clear button.
20) Load Settings Button
Uploads a file of saved settings to the device. This reconfigures the
IntelliMix settings of all units in a Link Group.
21) Save Settings Button
Select the Save Settings button to save the mixer settings (configuration of the Input, IntelliMix, Output and Preferences tabs). Note: Link Group and IP settings are not saved.
22) No Lights Mode
Turns off all visual indicators on the mixer (except the Power LED on the front panel).
23) Reset
Returns the mixer to default factory settings (clearing the password and device and channel names). The mixer will reboot in Standalone mode.
24) Register This Product
Links to Shure website for product registration.
25) Event Log Link
Links to the device’s Event Log, which opens in a new browser tab or window. The log displays a list of all informational system events.
27
Log On Page
This page is only displayed after a password has been set from the
Preferences tab, establishing an Administrator log in. When there is no
Administrator, there are no restrictions changing a device’s settings.
Note: No more than five Administrators or Guests should be logged on to a device’s GUI at the same time. Opening more instances may degrade system performance.
1) User
When a password is set, there are two levels of access for the GUI:
• Admin: Full editing rights.
• Guest: User can only monitor (cannot change settings).
2) Password
Required for Admin access. The password can be set or cleared on the
Preferences tab.
3) Keep Me Logged On
When selected, this allows the user to bypass the Log On page when reopening the GUI.
4) Language
Sets the language of the GUI. This setting is saved to the computer’s cookies.
Event Log
The event log provides a detailed account of mixer activity from the moment the mixer is powered on. The log collects and time-stamps up to 1,000 activity entries for the mixer. The Event Log is a reference tool for troubleshooting when calling Shure Systems Support or Service
Department.
The log categorizes entries into Events, Warnings and Errors:
• Events: An action has been successfully completed.
• Warnings: An action can not be completed, though overall mixer functionally is stable.
• Errors: Catastrophic problem has occurred that inhibits the mixer’s functionality. This corresponds to the 8-bit error codes that flash on the front-panel LEDs.
Viewing the Event Log
1. Open the Preferences tab of the GUI.
2. Select the Event Logs link from the Preferences panel. The log is located with the device’s DNS name: <device URL>/logs.
28
①
②
③
④
Troubleshooting
Audio
Problem
Distorted audio
No Audio/Faint Audio
Indicator
Channel Status LED = Flashing Red
Mix Output meter = Clipping
Channel LEDs in Channel Meter mode (front panel) = Off
Mix Output meters = Off
Solution
• Set Analog Input to a lower level
• Turn down master gain
• Check cables
• Enable Phantom power for condenser microphones
• Check Input Gain Level
• Ensure mix is unmuted
• Turn up Master volume knob
• Check channel routing from IntelliMix tab of the GUI
• Check Link Group and Network LEDs (see Link Groups).
Network
Problem
Can't Connect to the GUI
GUI is taking a long time to load
GUI is slow
Indicator
Device not appearing in Shure Web Device
Discovery application
Device appears in Shure Discovery application, but web browser cannot connect to the device
Browser opens but the GUI is slow to load
Indicators are moving slowly or not displaying in real time.
Solution
• Ensure the mixer is powered
• Properly connect the Primary port to the computer's network
• Turn off other network interfaces not used to connect to the mixer
(including WiFi)
• Check that DHCP server is functioning (if applicable)
• Ensure Bonjour is running on the PC
• Download latest version of Adobe Flash
• Ensure PC and mixer are on the same subnet
• Set the computer gateway to 0.0.0.0
• Set the router to not send default gateway as a part of DHCP
• Manually set the computer to a static IP address on the same network as the mixer
• Ensure that five or less windows are open to the same GUI
• Disable software meters from GUI Preferences tab
• See Network section for properly setting up the network
Network Audio and Link Groups
Problem
Network audio is missing or distorted
No audio output for mixers in a Link Group
Indicator
Green
Network Audio LED
Flashing Green
Red
Off
AutoMix Link LED
Green
Flashing Green
Off
Solution
• Check channel and mix gain
• Ensure the mixer has a stable network connection
• Use Dante Controller software (DC) to verify channel subscriptions
• Check master clock in DC
• Use DC to properly route audio channels
• Turn up master gain control
• Check Global/Local setting for the Mix Outputs
• Wait until the group has reconfigured
• Ensure the mixer has been assigned to a Link Group from the Link Group tab of the GUI
Hardware
Problem
Can't make adjustments to the mixer
No LEDs are turning on lockout
Indicator
LED = Red
Solution
• Press and hold lockout button on the back panel for 5 seconds to disable the lockout.
• If the mixer is still locked, open the GUI and uncheck the Hardware Lockout button in the
Preferences tab.
• Uncheck No Lights Mode from the GUI Preferences tab Power button = On
For additional Troubleshooting assistance or further information on complex installations, contact Shure to speak with a support representative. In the
Americas region, call Systems Support group at 847-600-8541. For users in other locations, go to www.shure.com to find support contact for your region.
For digital audio networking help, advanced networking guidelines and Dante software troubleshooting, visit Audinate's website at www.audinate.com.
29
Event Log
The event log provides a detailed account of mixer activity from the moment the mixer is powered on. The log collects up to 1,000 activity entries for the mixer, and time-stamps them relative to the last power cycle.
To troubleshoot audio or hardware problems, press Save Log to export to a computer file. Refer to the log file for details when troubleshooting or consulting with Shure Systems Support.
The log categorizes entries into Events, Warnings and Errors:
• Events: An action has been successfully completed.
• Warnings: An action can not be completed, though overall mixer functionally is stable.
• Errors: A problem has occurred that could inhibit the mixer's functionality.
This corresponds to error messages that flash on the front-panel LEDs.
Viewing the Event Log
To view the event log:
1. Open the Preferences tab of the GUI.
2. Select the Event Log hyperlink on the bottom left of the Preferences panel. The log is located with the device's DNS name: <device URL>/
eventlog/.
Front-Panel Error Messages
An error message is generated on the Channel LED rings when operating or environmental conditions occur that could potentially harm the mixer. These types of messages indicate the mixer has experienced a critical failure. Before calling Shure System Support, try these basic debugging tools:
1. Open the Event Log and press Save Log to export the file to your computer.
2. Power cycle the device by switching the power button off and on again.
3. Reset the device to factory default settings. This will clear all configurations made to the mixer.
4. Download the latest firmware from Shure.com and load it to the device.
5. If the error message persists, contact a Shure support representative for your region.
Note: To temporarily clear an error message until troubleshooting can be conducted, simultaneously press the Channel 1 knob and Front Panel
Mode selector.
Device Overheating Message
One example of an error message is the Device Overheating message. This appears on the channel LEDs in the following pattern as illustrated in the drawing. For this message, it is recommended that the device be immediately cooled down to avoid permanent damage. If the problem persists, follow the steps listed above to try to clear the message.
1 2 3 4 5 6 7 8
Device Overheating Error Code
30
Audio Frequency Response
20 Hz to 20 kHz (±1 dB)
Dynamic Range
20 Hz to 20 kHz, A-weighted, typical
Analog-to-Analog 110 dB
Analog-to-Dante, Dante-to-Analog 113 dB
Output Noise (mix output / direct output)
20 Hz to 20 kHz, A-Weighted, one channel open
Line (-0dB)
−90 dBV
Output Pad
Aux (-20dB)
−110 dBV
Mic (-46dB)
−135 dBV
Specifications
Digital Signal Processing
AD/DA Converter
24-bit, 48 kHz, 113 dB dynamic range typical
Internal Processing
32-bit
Latency
From channel input to mix output, Estimated Nominal, ±0.1 ms
Single Device ( ms) In a Link Group ( ms)
Analog to Analog
Analog to Dante
Dante to Analog
Dante to Dante
0.51
0.29
0.28 + T
N
0.06 + T
N
0.76 + 4T
N
0.54 + 4T
N
0.53 + 5T
N
0.31 + 5T
N
Equivalent Input Noise
20 Hz to 20 kHz, A-Weighted, input terminated with 150Ω, digital gain at +18 dB
Line (+0dB)
−93 dBV
Input Gain Setting
Mic (+26dB)
−118 dBV
Mic (+46dB)
−130 dBV
T
N
= Network latency in milliseconds, as set in the device preferences page or Dante Controller.
Note: Dante network latency is typically associated with the receiving device.
Channel Input Processing
Gain Adjustment Range −110 dB to +18 dB
THD+N
1 kHz, +4 dBu out, mix output (MASTER) at +0 dB
<0.05%
Common Mode Rejection Ratio
150Ω balanced source, at 1kHz
>70 dB
Polarity
Non-inverting, any input to any output
Dimensions
44 mm x 483 mm x 289 mm (1.7 in. x 19.0 in. x 11.4 in.), H x W x D
Weight
5.5 kg (12.0 lbs)
Housing
Steel; Extruded aluminum
Power Requirements
100 to 240 V AC, 50-60 Hz, 1 A
Operating Temperature Range
−18°C (0°F) to 63°C (145°F)
Storage Temperature Range
−29°C (-20°F) to 74°C (165°F)
High Shelf
Corner: 5 kHz
Slope: 12dB/octave
Gain: −18 dB to +18 dB
Mix Output Processing
Gain Adjustment Range −110 dB to +18 dB
Low Shelf
High Shelf
Corner: 25 Hz to 20 kHz
Slope: 12dB/octave
Gain: −18 dB to +18 dB
Corner: 25 Hz to 20 kHz
Slope: 12dB/octave
Gain: −18 dB to +18 dB
Limiter
Ratio: 10:1
Threshold: −50dBFS to −2dBFS
Attack: 0.1 ms
Decay: 100 ms
Analog Connections
Channel Input
Digital Feedback Reducer (DFR) Processing
Number of DFR Blocks 2
Number of Notch Filters 1 to 16 (default)
Configuration
Active Balanced
Impedance
5 kΩ
Clipping Level
Line (+0dB) Mic (+26dB) Mic (+46dB)
+20 dBV −6 dBV −26 dBV
Notch Filter Depth 0 db to −18 dB in 0.5 dB increments
Phantom Power
48 V DC, selectable per channel, 14 mA max.
Mic level settings only. Phantom power automatically switched off in LINE position.
Aux Input
Configuration stereo, unbalanced
Impedance
10 kΩ
Clipping Level
+10 dBV
Networking
Network Interface
SCM820 Single Port, 10/100 Mbps Ethernet
SCM820-DAN Dual Port, Gigabit Ethernet, Dante digital audio
Mix Output
Configuration Impedance
Cable Requirements
Cat 5e or higher, shielded, 100 m maximum
Network Addressing Capability
DHCP, link-local, static
Active Balanced 350 Ω
Max Output Level
Line (-0dB) Aux (-20dB) Mic (-46dB)
+20 dBV 0 dBV −26 dBV
Direct Output
Configuration
Impedance Balanced
Impedance
150 Ω
Max Output Level
+20 dBV
Headphone Output
6.35 mm (1/4") TRS, 100 mW, 350 Ω, dual mono (will drive stereo phones)
31
32
IP Ports and Protocols
2202
5353
5568
8023
8180*
8181*
8427
64000
21
22
23
68
80*
427
443
161
162
843*
Shure Control
Port TCP/UDP tcp tcp udp tcp tcp udp udp tcp tcp tcp tcp tcp tcp tcp tcp udp tcp tcp/udp
Protocol
FTP
SSH
Telnet
DHCP
HTTP
SLP
HTTPS
SNMP
SNMP
Flash
ASCII mDNS
SDT
Telnet
Flash
Flash
Multcast SLP
Telnet
Description Factory Default
Required for firmware updates (otherwise closed) Closed
Not supported Closed
Standard console interface
Dynamic Host Configuration Protocol
Required to launch embedded web server
Required for inter-device communication
Closed
Open
Open
Open
Not supported
Not supported
Not supported
Required for web GUI
Closed
Closed
Closed
Open
Required for 3rd party control strings
Required for device discovery
Required for inter-device communication
Debug console interface
Required for web GUI
Required for web GUI
Required for inter-device communication
Required for Shure firmware update
Open
Open
Open
Password
Open
Open
Open
Open
Dante Audio & Controller
162
[319-320]*
4321, 14336-14600
[4440, 4444, 4455]*
5353
[8700-8706, 8800]*
8751
16000-65536
Port TCP/UDP
SNMP
PTP
Dante
Dante mDNS
Dante
Dante
Dante
Protocol udp udp udp udp udp udp udp udp
*These ports must be open on the PC or control system to access the device through a firewall
Description
Used by Dante
Dante clocking
Dante audio
Dante audio routing
Used by Dante
Dante Control and Monitoring
Dante Controller
Used by Dante
D
A
D
A
Fixed
Gain
Fixed
Gain
Out-Z
Connector Diagrams
Impedance Balanced Output
Out-Z
Out-Z
+
-
-18 dBFS = +4 dBu
+
-
+4 dBu = -18 dBFS
OUTPUT PAD
L
R
Cross-Coupled Output
-20dB -46dB
+
-
+4 dBu = -18 dBFS
Fixed
Gain
Out-Z
-18 dBFS = +4 dBu
+48V
Fixed
Gain
Fixed
Gain
A
D
A
D
Mic-
Pre
Input Trim
A
D
Pinouts are from the perspective of looking at the back of the unit
MIX A
MIX OUTPUTS
MIX B
L +R
SUM
AUX IN
INPUTS 1-8 DIRECT OUTPUTS 1-8
A
INTELLIMIX manual
A smooth classic extreme custom
B dual mixer
CHANNEL
CH line
+0dB mic
+30dB mic
+46dB phm 48 VDC auto link secondary lockout primary reset
Channel Inputs and Direct Outputs
13
25
1 2 3 4 5 6 7 8
14
1
=
=
=
Mix Outputs
Aux Input
L
R
=
=
=
Ground
Positive
Negative
IN
OUT mix a
AUX IN
L R
+
IN
+ mix b
+ direct out
+
IN
+
IN
+
8 direct out
+
7 direct out
Inputs gate
=
= mute ovrd gnd
+
IN
+
IN
+
IN
+
6 direct out
+
5 direct out
+
4 direct out
+
IN IN
+
+
3 direct out
+
2 direct out
1
A
INTELLIMIX
B manual A smooth classic extreme custom dual mixer
B
CHANNEL line
+0dB mic
+30dB
CH phm 48 VDC auto link lockout
Direct and
Mix Outputs
+ reset
Aux Input
L R
Out
Aux
From SCM820
IntelliMix Processing
+5 V
10K
GATE
OUT
MUTE IN
OR
OVERRIDE
IN
+5 V
100K
To SCM820
IntelliMix Processing
LOGIC
GROUND
33
Europe, Middle East, Africa:
Shure Europe GmbH
Jakob-Dieffenbacher-Str. 12,
75031 Eppingen, Germany
Phone: 49-7262-92490
Fax: 49-7262-9249114
Email: [email protected]
PT. GOSHEN SWARA INDONESIA
Kompleks Harco Mangga Dua Blok L No. 35 Jakarta Pusat
I.16.GSI31.00501.0211
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Table of contents
- 3 Table of Contents
- 4 Overview
- 4 IntelliMix® Operating Principles
- 4 Mixer Modes
- 4 Dual Mixer Operation
- 4 DFR and Audio Processing
- 4 Networking
- 4 Model Variations
- 5 SCM820 Description
- 5 Front Panel
- 6 Rear Panel
- 7 Signal Path Diagram
- 8 Operating the Mixer
- 8 Front Panel Modes
- 8 Audio Mute and Bypass
- 8 Monitoring
- 9 The SCM820 Graphical User Interface
- 9 Graphical User Interface (GUI)
- 9 Accessing the GUI
- 10 Installation
- 10 Rackmounting
- 10 Power
- 10 Typical Audio Connections
- 10 Furnished Accessories
- 11 Configuring the Inputs and Outputs
- 12 Setting IntelliMix
- 12 Mixer Mode Descriptions
- 13 IntelliMix Parameters
- 13 Selecting the Mixer Mode
- 13 Single or Dual Mixer Operation
- 14 Networking
- 14 Network Overview
- 14 Digital Audio Networking
- 16 Dante Software by Audinate
- 16 Dante Controller
- 16 Dante Virtual Soundcard
- 17 Application Examples
- 17 Creating a Link Group
- 17 Integrating with Other Systems
- 17 Configuring for Use with a Choir
- 18 Internet Calling
- 18 Logic
- 19 Digital Feedback Reduction (DFR)
- 19 Function
- 19 Basic DFR Setup
- 20 Assigning DFR
- 20 Filter Types
- 20 Filter Width
- 21 GUI Description
- 21 Navigation Bar
- 22 Input Tab
- 23 Intellimix Tab
- 25 Digital Feedback Reduction (DFR) Tab
- 26 Output Tab
- 27 Link Group Tab
- 28 Preferences Tab
- 30 Log On Page
- 31 Troubleshooting
- 32 Event Log
- 32 Front-Panel Error Messages
- 33 Specifications
- 33 Analog Connections
- 33 Digital Signal Processing
- 33 Networking
- 34 IP Ports and Protocols
- 35 Connector Diagrams