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Clear-Com Encore
TM
MS-704, RM-704, SB-704 4-Channel Intercom Stations
Features:
MS-704
RM-704
• Four Independent Intercom Channels
for ultimate flexibility
• Microprocessor-Controlled Logic
assures maximum communications
power
• Universal Voltage Power Supply for
100 - 240 VAC operation, with shortcircuit protection on each channel
• Linking Control instantly links channels
together in “super party line”
• Separate Talk and Listen Buttons
for each channel
• Individual Listen Volume Controls
for each channel
SB-704
The 704 series is Clear-Com’s most advanced party-line intercom
system. Each station is a four-channel intercom with superior audio
and versatile channel access to provide unmatched communication
flexibility. All front-panel controls are intuitive and easy to operate.
The station’s front-panel buttons are programmable and can be
customized for a wide variety of applications that will meet the
demands of any stage, studio, or field producer. Separate volume
controls for every channel ensure the perfect audio mix in the
headset or on the integral speaker.
The SB-704 includes a versatile switching matrix which allows up
to ten different groups of stations to be assigned to any one of the
four channels. The regulated power supply in the MS-704 and
SB-704 provides power for the entire intercom system.
SB-704 Main Station
This station is similar to the MS-704 main station except the speaker
is replaced by a 10 x 4 assignment matrix panel. The assignment
matrix panel allows you to choose any intercom station or group of
stations connected to the ten inputs of the matrix and assign them
to any one of the four intercom channels.
RM-704 Remote Station
The RM-704 remote station is powered directly from the intercom
line and requires no external AC power, allowing it to be placed
anywhere regardless of available electrical mains. The RM-704 has
all of the same functions as the MS-704, except that it has no power
supply, circuit breaker, or linking function.
• “All-Talk” Function permits instant
communications to all four channels
• Four Separate Program Inputs are
electronically balanced
• Three Interruptible IFB Channels
make talent cueing easy
• “Announce” Button with Relay for
external paging
• Visual “Call Signaling” alerts users
when others want to speak to them
• Wide-Range High-Output Speaker
for optimum clarity in all acoustic
environments
• “Hot-Mic” Output allows easy
connection to external IFBs
• Adjustable Mic Proximity
Compensation reduces acoustic
feedback
• Superior “Contoured” Audio insures
excellent voice intelligibility under all
noise conditions, including high-noise
environments
• LED buttons for talk, call, announce,
link, all talk, and mic on
• Remote Mic Kill switch turns off the
microphone talk circuits
www.clearcom.com
Clear-Com Encore
TM
MS-704, RM-704, SB-704 4-Channel Intercom Stations
MS-704 Front Panel Features
1
2
3
4
5
6
7
8
9
10
11
12
Channel B
Channel A
Channel C
13
14
Channel D
Mic On
Announce
Panel Mic
Listen
Listen
Listen
All Talk
Talk
Talk
Talk
Link On
Call
Call
Call
Volume
Panel
Short
Headset
On
Headset
Mic Select
Ch. A
Ch. B
Off
Speaker
Remote
Mic Kill
(Short)
Off
Ch. C
Long
(Dflt)
Ch. D
Sidetone
Adjust
Panel Mic
Gain
15
16
17
(On)
HS B C D
A B C D
A B C D
A B C D
Lim Program
Interrupt
Auto-Call
Auto-Talk
/Listen
Talk Latch
Disable
18
19
20
21
Program
Level
22
A B C D
Program
On/Off
23
Null
Listen
Pgm
Channel A
24 25
Null
Listen
Pgm
Channel B
Null
Listen
Pgm
Channel C
Null
Listen
Pgm
Channel D
26
A B C D
Line
Length
4-Channel
Main Station
MS-704
27
2. Panel Mic Connector
Allows easy attachment of proprietary
9" or 18" gooseneck microphone
12. Volume Control
Adjusts the listening level for both speaker
and headset.
24. Null Control
Used in conjunction with line/link switch to
minimize intercom channel crosstalk in station.
13. Speaker On/Off Switch
Selects or deselects the built-in speaker.
25. Listen Level Control
Adjusts the listen level for each intercom channel.
3. Mic on Switch/Indicator
Blue-color LED; button illuminates when
the microphone is active.
14. Loudspeaker
High-quality loudspeaker is driven by a
four-watt proaudio amplifier.
26. Program Adjust
Controls the level of program audio sent out to each
individual channel.
4. Mic Select Switch
Selects between the panel mounted
gooseneck mic and the headset mic.
15. Short Indicators
Illuminates when a short is detected on
one or more of the lines while power will
be supplied to other channels.
27. Line Length Select Dip Switch
Compensates for electrical capacitance on each
individual intercom channel to optimize null adjust.
1. Headset Connector
XLR 4-pin male
5. Remote Mic Kill
Amber-color LED turns off the microphone 16. Panel Mic Gain
Adjusts the sensitivity of the gooseneck
talk circuits of all Clear-Com beltpacks in
panel mic.
the system (MS-704 & SB-704) .
6. Link Button
Amber-color LED; links channels B, C,
and/or D to Channel A.
17.Sidetone Adjust
Controls the level of your voice as it is
heard in your own headset and speaker.
7. All Talk Buton
Amber-color LED ; sends the station's mic
signal to all four channels.
18. Program Interrupt Select (IFB)
Selects which channel the program
interrupt will operate.
19. Auto Call Select
8. Announce Button
Sends a call signal automatically when the
Amber-color LED; directs station's mic
signal to dedicated rear-panel "announce" TALK button is depressed.
output while activating associated relay
20. Auto Talk/Listen Select
Allows the TALK and LISTEN circuit to be
9. Call Button
automatically activated when the TALK
Red-color LED; Activates all station
and beltpack call lights on the respective button is depressed.
intercom channel; also functions as
21. Latch Disable Select
attention-getting “Call” lights.
TALK button is momentary function only.
10. Listen Button
22. Program Level
Green-color LED; Turns on LISTEN
Adjusts the level of the Audio Program
circuit on corresponding channel.
feed to the station speaker.
11. Talk Button
23. Program Select
Blue-color LED (on), amber-color LED
(off); illuminated dual-action buttons light Determines which intercom channels the
audio program feed will be sent to.
up to indicate the on-off status of each
channel’s TALK circuit.
Matrix Assignment Switch
(SB-704 only - not shown)
Assigns an intercom station to any one of the four
channels or to an off or party-line position.
Superior “Contoured” Audio
Compatible with all Clear-Com party-line
intercoms, the 704 series accepts a wide range
of dynamic headsets, with a choice of headset
connectors. Optional plug-in noise-cancelling
gooseneck microphones are available in 9” and
18” lengths.
Remote Mic Kill (RMK)
The MS-704 is equipped with a global RMK
button. It will turn off the microphone talk
circuits of all Clear-Com beltpacks in the system,
eliminating extraneous noise from the “open”
headset microphones.
www.clearcom.com
Clear-Com Encore
TM
MS-704, RM-704, SB-704 4-Channel Intercom Stations
MS-704 Rear Panel Features
28
Technical Specifications:
29
30
Channel A
Term
29
30
Channel B
Term
WARNING: TO PREVENT
FIRE OR SHOCK HAZARD DO NOT
EXPOSE THIS EQUIPMENT TO RAIN
OR MOISTURE.
Hot Mic/IFB
34
On
On
Off
Off
MS-704
32
On
On
Off
Off
Program In
Auxiliary
CAUTION: TO PREVENT
ELECTRIC SHOCK DO NOT
REMOVE COVER. NO USER
SERVICEABLE PARTS INSIDE.
REFER TO QUALIFIED SERVICE
PERSONNEL.
Channel C
Channel D
Announce Out
Output: 30V, 1.2A Continuous, 2A Peak
33
31
28. Power Connector And Switch
EIA power connector for 100 -240 VAC operation.
29. Intercom Connectors
(See specifications)
30. Channel Termination Switches
Provides individual termination for each intercom channel.
31. Announce Output (XLR-M 3-PIN)
Line-level transformer-isolated audio output.
32. Program Input #1 (XLR-F 3-PIN)
Electronically balanced line-level audio input that is sent to the station or selectively to
the intercom channels.
33. Hot MIC/IFB Output
Provides line-level audio output from mic at all times while on and provides feed to
external IFB system.
34. Aux Connector (DB-25F)
Provides 4 separate Program Inputs, announce Relay contacts, and a footswitch input.
Redundant “Failsafe” Power Supply
The 1.2-amp universal switching power supply is a 30-volt regulated supply
with multiple short-circuit protection. It can sense the difference between
a long-term short circuit and an instantaneous overload, allowing the
intercom to continue to operate even when a station is plugged in,
momentarily exceeding the capacity of the power supply. If a shutdown
occurs from a shorted intercom cable, the power supply will recover under
full load when the short is removed.
“Easy Access” Sub Panel
A removable front panel gives the operator easy access to the station’s
configuration switches and trim pots. Clearly labeled and simple to adjust,
these controls allow the station to be instantly configured for virtually any
communications application. When configuration is complete, the front
panel re-attaches, revealing only those controls useful for normal operation.
Multiple Program Audio Sources
The station accepts five separate program audio sources: four line-level
balanced inputs and one assignable line level input. The assignable
program input accepts a balanced signal and is designed for monitoring
external audio in the headset or speaker. The four balanced program inputs
can be used to create individual program feeds on the intercom channels.
Three of these channels can be used for program interrupt.
dBu is an absolute measurement. 0 dBu is referenced to 0.775
volts RMS
Panel Microphone Input
Input Type:
Electret
Input Impedance:
>=2KΩ
Mic Limiter Threshold:
0dBu ±3dB
Mic Limiter Range
(MS-704 & RM-704):
>= 20dB
Mic Limiter Range (SB-704): >= 15dB
Headset Microphone Input
Input Type:
Dynamic
Input Impedance:
>= 1KΩ
Mic Limiter Threshold:
0dBu ±3dB
Mic Limiter Range
(MS-704 & RM-704):
>= 17dB
Mic Limiter Range (SB-704): >= 15dB
Program Line Input
Maximum Level before
Clipping:
Input Impedance:
>= 20dBu
>= 5KΩ
Headset Output
Load Impedance:
>= 8Ω
Output Impedance:
<= 25Ω
Output Limiter Threshold:
+5dBu ± 3dB
Maximum Output Level before
Distortion:
>= 17dBu
Speaker Output
Load Impedance:
Max Output Level before
1% Distortion:
>= 4Ω
20dBu ± 2dBu
Party Line Output
Off Noise:
Output Impedance:
< -74dBu
>10KΩ
Party Line Input
Crosstalk:
Max level before Clipping:
Sidetone Null Capability:
< -60dB
>= 12dBu
> 25dB
Stage Announce/Balanced Line Out
Type:
Balanced
Output Impedance:
>= 200Ω
Load Impedance:
>= 600Ω
IFB/Hot Mic
Type:
Output Impedance:
Load Impedance:
U nbalanced
150Ω
>= 600Ω
Frequency Response
Panel Mic - Party Line:
Headset Mic - Party Line:
Headset Mic - Line Out:
Program Input - Party Line:
Program Input - Headset Out:
Program Input - Speaker Out:
Party Line - Headset Out:
Party Line - Speaker Out:
600 - 10KHz ± 3dB
200 - 12KHz ± 3dB
200 - 12KHz ± 3dB
100 - 17KHz ± 3dB
200 - 10KHz ± 3dB
300 - 10KHz ± 3dB
200 - 10KHz ± 3dB
300 - 10KHz ± 3dB
www.clearcom.com
Clear-Com Encore
TM
MS-704, RM-704, SB-704 4-Channel Intercom Stations
Max Distortion
Panel Mic - Party Line:
Headset Mic - Party Line:
Headset Mic - Line Out:
Program Input - Party Line:
Program Input - Headset Out:
Program Input - Speaker Out:
Party Line - Headset Out:
Party Line - Speaker Out:
<= 0.5%
<= 0.5%
<= 0.5%
<= 0.2%
<= 0.2%
<= 0.5%
<= 0.2%
<= 0.5%
Noise
Panel Mic - Party Line:
Headset Mic - Party Line:
Headset Mic - Line Out:
Program Input - Party Line:
Program Input - Headset Out:
Program Input - Speaker Out:
Party Line - Headset Out:
Party Line - Speaker Out:
< -65dBu
< -70dBu
< -55dBu
< -85dBu
< -60dBu
< -60dBu
< -50dBu
< -50dBu
Max Gain
Panel Mic - Party Line:
>= 37dB
Headset Mic - Party Line:
41dB ± 2dB
Headset Mic - Hot Mic Out: 55dB ± 3dB
Headset Mic - Announce Out: 55dB ± 3dB
Program Input - Party Line:
>= -16dB
Program Input - Headset Out: >= 18dB
Program Input - Speaker Out: >= 24dB
Party Line - Headset Out:
>= 34dB
Party Line - Speaker Out:
>= 40dB
Min Gain
Panel Mic - Party Line:
<= 25dB
Announce Out:
Program:
Hot Mic / IFB Interface
Accessory:
(1) XLR-3M (audio)
(1) XLR-3F
(1) 1/4 in. (0.64 cm)
phone jack
(1) DB-15F
Rear Panel Connectors (SB-704)
Switched Intercom:
(10) XLR-3M (1 per
channel)
Intercom:
(4) XLR-3M (1 per
channel)
Announce Out
(1) XLR-3M (audio)
Program In:
(1) XLR-3F
Hot Mic / IFB Interface:
(1) 1/4 in. (0.64 cm)
phone jack
External Speaker:
(1) 1/4 in. (0.64 cm)
phone jack
Accessory:
(1) DB-15F
AC Power:
IEC 320 connector
Rear Panel Controls (MS-704)
(1) Power switch
Rear Panel Controls (SB-704)
(1) Power switch
(4) Intercom On/Off Switches
Front Panel Connectors
Panel Mic:
Headset:
(1) 1/4 in. (0.64 cm)
panel mounting jack
(1) XLR-4M
Front Panel Controls & Indicators (MS-704)
(1) Panel / headset mic switch
(1) Mic on button
(1) All talk button
(1) Announce button
(1) Party line link button
(4) Program
ON-OFF-INTERRUPT DIP switches
(1) Program level control
(4) Listen adjust controls
(4) Channel null adjust controls
(4) Channel program feed adjust controls
(4) Talk buttons
(4) Call buttons
(4) Listen buttons
(1) RMK button
(1) Speaker ON-OFF switch
(1) Speaker volume control
Station Capacity (MS-704 & SB-704)
Up to 40 RS-601 beltpacks or 10 speaker stations or (4) Short LEDs
(1) Panel mic gain control
12 headset stations distributed over all channels
(1) Sidetone adjust control
(1) Headset audio limiter DIP switch
DC Power (RM-704)
(3) Interrupt enable DIP switches
Input Voltage Range:
20-30 VDC
(4) Auto-call DIP switches
Input Current (Idle):
<=165 mA
(4) Auto-talk/listen DIP switches
Input Current (Max):
<=195 mA
(4) Talk latch disable DIP switches
Rear Panel Connectors (MS-704)
(4) Line length DIP switches
Intercom:
XLR-3M (2 per
Front Panel Controls & Indicators (RM-704)
channel)
(1) Panel / headset mic switch
Announce Out:
XLR-3M (audio)
(1) Mic on button
Program:
(1) XLR-3F
(1) All talk button
Hot Mic / IFB Interface:
(1) 1/4 in. (0.64 cm)
(1) Announce button
phone jack
(4) Program
Accessory:
(1) DB-15F
ON-OFF-INTERRUPT DIP switches
AC Power:
IEC 320 connector
(1) Program level control
Rear Panel Connectors (RM-704)
(4) Listen adjust controls
Intercom:
(4) XLR-3M (1 per
(4) Channel null adjust controls
channel) (4) XLR-3F
(4) Channel program feed adjust controls
(1 per channel)
(4) Talk buttons
Mains Power (MS-704 & SB-704)
Input Voltage Range:
100 - 240 VAC
Input Frequency Range:
50 - 60 Hz
Input Power:
<= 60 VAC
Output Voltage:
30 VDC ± 0.5V
Output Current per Channel
(Continuous):
1.2 A
Output Current per Channel
(Peak):
2 A (Do not exceed
the 1.2A rating for
more than 2 seconds
per 1 minute period)
Short Circuit Recovery Time
(1st short):
<= 0.5 sec
Short Circuit Recovery Time
>= 20 shorts in 20sec):
<= 20 sec
(4) Call buttons
(4) Listen buttons
(1) Speaker ON-OFF switch
(1) Speaker volume control
(1) Panel mic gain control
(1) Sidetone adjust control
(1) Headset audio limiter DIP switch
(3) Interrupt enable DIP switches
(4) Auto-call DIP switches
(4) Auto-talk/listen DIP switches
(4) Talk latch disable DIP switches
(4) Line length DIP switches
Front Panel Controls & Indicators (SB-704)
(1) Panel / headset mic switch
(1) Mic on button
(1) All talk button
(1) Announce button
(1) Party line link button
(4) Program
ON-OFF-INTERRUPT DIP switches
(1) Program level control
(4) Listen adjust controls
(4) Channel null adjust controls
(4) Channel program feed adjust controls
(4) Talk buttons
(4) Call buttons
(4) Listen buttons
(1) RMK button
(1) Speaker ON-OFF switch
(1) Speaker volume control
(4) Short LEDs
(1) Panel mic gain control
(1) Sidetone adjust control
(1) Headset audio limiter DIP switch
(3) Interrupt enable DIP switches
(4) Auto-call DIP switches
(4) Auto-talk/listen DIP switches
(4) Talk latch disable DIP switches
(4) Line length DIP switches
(10) Channel Assignment Slide switches
Environmental
32 - 122˚F (0 - 50˚C)
Dimensions
19 in. W x 3.5 in. H x 10.5 in. D
(483 mm x 88 mm x 267 mm)
Weight
10.86lbs. (4.94 kg) (MS-704)
10.07lbs. (4.58 kg) (RM-704)
10.93 lbs. (4.97 kg) (SB-704)
Notice About Specifications
While Clear-Com makes every attempt to maintain the
accuracy of the information contained in its product
manuals, that information is subject to change without
notice. Performance specifications included in this manual
are design-center specifications and are included for
customer guidance and to facilitate system installation.
Actual operating performance may vary.
www.clearcom.com
Americas and Asia-Pacific Headquarters California, United States Tel: +1.510.337.6600
Europe, Middle East and Africa Headquarters Cambridge, United Kingdom Tel: +44 1223 815000
China Office Beijing, P.R. China Tel: +86-10-65811360/65815577
© 2011. Clear-Com LLC. All rights reserved. ® Clear-Com, the Clear-Com logo, and Clear-Com Encore are registered trademarks of HM Electronics, Inc.
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