Early ISC Control Unit/Speaker Processor

Early ISC Control Unit/Speaker Processor
Early ISC Control Unit/Speaker Processor
Information Sheet
IMPORTANT - PLEASE READ THIS FIRST
Apart from very early units with fixed power cables, these are dual voltage
units. It is essential that you check that the voltage on the fuseholder cover
below the AC connector on the rear of the chassis is set correctly before
connecting it to AC power.
THIS IS SET FOR 100 V AC TO
120 V AC OPERATION
THIS IS SET FOR 220 V AC TO
240 V AC OPERATION
To change, pull fuseholder out and rotate 180o, then push in again. Do not insert
power cable into unit until voltage has been correctly set. Do not plug power
cable into AC power until voltage has been correctly set
INTERNATIONAL LIMITED WARRANTY DISCLAIMER
All these products are out of warranty. The information contained in these notes is given in good faith to
the best of our knowledge, and believed to be accurate, BUT NO GUARANTEE OF ITS ACCURACY IS
EITHER EXPRESSED OR IMPLIED. Many units may also have been modified by their owners over the
years from their original specifications, and that should be kept in mind when using these products.
You’re on your own.
!!! Check carefully at each stage for correctness of wiring and function before powering up !!!
ARX Systems Pty Ltd, PO Box 15,
Moorabbin, Victoria 3189, Australia
Phone
Phone: (03) 9555 7859 Fax
Fax: (03) 9555 6747
International Fax
Fax: +61-3 -9555 6747
On the Web
Web: www.arx.com.au
Email
Email: info@arx.com.au
Early ISC Speaker Processor Owner's Information - all models ©2004 ARX®
Introduction
These notes have been compiled for the benefit of owners of older ART/ARX speaker processors. Please pay close
attention to the section on connecting the I.S.C. leads to the processor. The colour code and channel selection is
particularly critical when putting the system together for the first time. Severe speaker damage can be caused by
incorrect wiring. So please, take it easy and check things as you go.
What is I.S.C?
I.S.C stands for Interactive System Control, ARX’s innovative Speaker and Electronics Interface.
ISC monitors the output of the power amplifier driving each set of Loudspeaker components and compares this signal
with an internal model of the SOA (safe operating area) of the driver. When the signal applied to the driver tries to
exceed that SOA, the signal is limited or held at a level which is safe for the driver to reproduce. As the driver signal
forms part of a feedback style loop this SOA can never be exceeded.
Why monitor the outputs of the amplifiers?
What interests us is the actual power being applied to loudspeaker components,
not the signal being applied to the input of the Power Amplifier. To measure this
accurately and allow the user their personal choice in Power Amplifiers we have
to access the outputs of the amplifier. This is used as the reference.
What size amplifier do I need?
ARX quote a “recommended minimum amplifier size” - we don’t quote power
handling. The ISC processor determines the amount of power supplied to each
speaker, ensuring this remains within the SOA of the driver. By recommending the minimum amplifier size we are
indicating that this is the least amount of available power required for ISC to operate in the way it was designed by ARX
engineers.
For example: If you operated a system from, say, a 100 watt per channel amplifier, and the ISC processor was designed
to begin operation at around the 200 watt level you would find the 100 watt amplifier completely squared off into
clipping (gross overload distortion) before the ISC processor was aware that any action was required, thus for all intents
and purposes cancelling out the system protection.
Where do I put the processor?
The processor is mounted with the Amplifiers in the amp rack. In most applications once the main frequency response
balance is set, system equalization is achieved by a Graphic or Parametric Equalizer, so there is no need to constantly
access the processor.
Part A - Two Way Systems
TYPICAL FRONT PANEL CONTROLS
Channel A level trim
These controls let you adjust the input level to the unit. During normal operation it is set at the maximum (10) position.
Note: this is an attenuator only, not a gain control. Setting this level too low may reduce the headroom in the preceding
equipment.All remaining controls are recessed behind an acrylic security cover. Unscrew the knurled nut at each end of
the cover and lift off to make adjustments.
Low control
This control determines the Low Frequency output of your system. During normal operation it is set at the 0dB (unity)
position (12 o’clock). It also provides up to +6 dB of gain past unity.
Low ISC LED
This LED indicates that the ISC protection circuitry is operating on the Low output. During normal operation this LED
will light up on transients or peaks if the system is being used to achieve high SPL. This is normal, and should not be
taken as an indication that the system is being overdriven. However, if this LED is on for the majority of the time, then
the Low level is too high and should be reduced.
High control and High ISC LED
Same as for Low but applicable to High
VHF level trim control
This control determines the Very High Frequency energy output of your system. It provides control from -12 dB (Hard
LEFT) through to 0 dB/unity (Hard RIGHT). It should be set in the 0 dB position for a flat response, but for a more
musical response you can rotate it anti-clockwise until the desired roll off is achieved.
Early ISC Speaker Processor Owner's Information - all models ©2004 ARX®
Connecting the ISC leads
--- Early Models with Red and Black leads
The Red and Black ISC leads, on 4 pin XLR connectors, plug into the corresponding sockets on the rear of the Control
Unit. The RED leads connect to the OUTPUTS of the LOW amplifiers, in parallel with the leads going to the LOW
speakers. The BLACK leads connect to the Outputs of the HIGH amplifier, in parallel with the leads going to the HIGH
speakers.
Pin configuration is Pins 1 and 2 - Red (Low), Pins 3 and 4 Black (High)
• Connect both RED leads to the LOW amp outputs, and both BLACK leads to the HIGH amp outputs. They are
not polarity sensitive and don’t mind whether they are connected to + or –.
• Make sure you don’t get these mixed up as you will end up with the LOW ISC controlling the HIGHs, and vice
versa, which can cause major speaker damage to the HIGH drivers.
• Make sure that the Channel A ISC leads are connected to the Channel A amplifiers, and Channel B leads to the
Channel B amplifiers, or you will end up with the Channel A ISC controlling Channel B and vice versa, which
can give very strange results AND CAN OVERDRIVE THE SYSTEM.
NOTE: If your amplifier has Black and Red output terminals, don’t attach one Black ISC lead to a Black
terminal and a Red one to a Red terminal. It won’t work and may cause damage.
• Work slowly and carefully, and take the time to get it right. It’s a good idea to mark all leads as you go, so you can
visually check all connections before powering up.
Also note that inputs and outputs on early processors, in keeping with the accepted standards of the time, were wired Pin
3 + (Hot), Pin 2 – (Cold), and Pin 1 Audio Ground
--- Later Models with White and Blue leads
The White and Blue ISC leads, on 6 pin XLR connectors, plug into the corresponding sockets on the rear of the Control
Unit. The WHITE leads connect to the OUTPUTS of the LOW amplifiers, in parallel with the leads going to the LOW
speakers. The BLUE leads connect to the Outputs of the HIGH amplifier, in parallel with the leads going to the HIGH
speakers.
These leads allow the Control Unit/Processor to monitor the output of the amplifiers, and to activate the protection
circuits if the power exceeds the maximum safe operating area of the speaker. These units won’t turn on until you make
these connections!
The White and Blue ISC leads, on 6 pin XLR connectors, plug into the corresponding sockets on the rear of the Control
Unit. The WHITE leads connect to the OUTPUTS of the LOW amplifiers, in parallel with the leads going to the LOW
speakers. The BLUE leads connect to the Outputs of the HIGH amplifier, in parallel with the leads going to the HIGH
speakers.
Pin configuration is Pins 1 and 2 - White (Low), Pins 3 and 4 Blue (High), Pins 5 and 6 trigger a relay to activate the
Control Unit, and to turn it off if the leads are removed
• Connect both WHITE leads to the LOW amp outputs, and both BLUE leads to the HIGH amp outputs. They are
not polarity sensitive and don’t mind whether they are connected to + or –.
• Make sure you don’t get these mixed up as you will end up with the LOW ISC controlling the HIGHs, and vice
versa, which can cause major speaker damage to the HIGH drivers.
• Make sure that the Channel A ISC leads are connected to the Channel A amplifiers, and Channel B leads to the
Channel B amplifiers, or you will end up with the Channel A ISC controlling Channel B and vice versa, which
can give very strange results AND CAN OVERDRIVE THE SYSTEM.
NOTE: If your amplifier only has Neutrik Speakon output terminals, you will need to connect the ISC
leads to the speaker cables by splicing them into the speaker cable after the connector, or by making up a
Y connector, so that one Speakon goes to the ISC leads, and the other goes to the speaker cable.
• Work slowly and carefully, and take the time to get it right. It’s a good idea to mark all leads as you go, so you can
visually check all connections before powering up.
Early ISC Speaker Processor Owner's Information - all models ©2004 ARX®
Rear Panel Configurations
CHANNEL A
CHANNEL B
ISC RETURNS
CU 215S REAR PANEL
AC POWER
INPUT AND FUSE.
CHECK FOR
CORRECT
VOLTAGE
IN
OUT TO
OUT TO
IN
FROM LOW AMP HIGH AMP
FROM
IN CH. A CONSOLE
CONSOLE IN CH. A
CHANNEL A
OUT TO
LOW
AMP IN
CH. B
OUT TO
HIGH AMP
IN CH. B
CHANNEL B
ISC
LEADS
FROM
CH. A
ISC
LEADS
FROM
CH. B
ISC RETURNS
CU 912/922S REAR PANEL
AC POWER
INPUT AND FUSE.
CHECK FOR
CORRECT
VOLTAGE
IN
FROM
CONSOLE
OUT TO OUT TO
MID/HIGH
LOW
AMP IN
AMP IN
CH. B
CH. B
OUT TO OUT TO
MID/HIGH
LOW
AMP IN
AMP IN
CH. A
CH. A
CHANNEL A
CHANNEL B
ISC
LEADS
FROM
CH. A
ISC
LEADS
FROM
CH. B
ISC RETURNS
CU 212S REAR PANEL
AC POWER
INPUT AND FUSE.
CHECK FOR
CORRECT
VOLTAGE
IN
FROM
CU118S
OUT TO
MID
AMP IN
CH. A
OUT TO
HIGH
AMP IN
CH. A
IN
FROM
CU118S
OUT TO
MID
AMP IN
CH. B
OUT TO
HIGH
AMP IN
CH. B
ISC
LEADS
FROM
CH. A
ISC
LEADS
FROM
CH. B
Part B - Sub Bass Systems
Channel A level trim
This control lets you adjust the input level to the Channel A circuitry. During normal operation it is set at the maximum
(10) position. This is an attenuator only, not a gain control. Setting this level too low may reduce the headroom in the
preceding equipment.
Normal/Reverse LEDs
These LEDs indicate the status of the Phase Reverse switch. Also, either one lit up indicates that the Control Unit is
connected to the AC power.
Phase Reverse switch This switch changes the Low Frequency output phase of the CU 118s by 180o
Normal/Sub switch
In the Normal position, the CU 118s covers Low frequencies from 250 Hz downwards. In the Sub posiion, it covers Low
frequencies from 90 Hz downwards. Use Normal position when using it in conjunction with the CU 212s control unit,
and Sub position when using it for Low frequency enhancement of other systems.
Level control
This control determines the Low Frequency output of your system. During normal operation it is set at UNITY,the 0 dB
nominal operating position (12 o’clock). It also provides up to +6 dB of gain past unity.
ISC LED
This LED indicates that the Interactive System Control protection circuitry is operating on the Channel A output. During
normal operation this LED will light up on transients or peaks if the system is being used to achieve high SPL. However,
if this LED is on for the majority of the time, then the Low level is too high and should be reduced accordingly.
Early ISC Speaker Processor Owner's Information - all models ©2004 ARX®
Connecting the ISC leads
The White and Blue Interactive System Control leads, on 6 pin XLR connectors, plug into the corresponding sockets on
the rear of the Control Unit. The WHITE leads connect to the OUTPUTS of the LOWamplifier Channel A, in parallel
with the leads going to the speakers. The BLUE leads connect to the Outputs of the LOW amplifier Channel B, in
parallel with the leads going to the speakers.
These leads allow the Control unit to monitor the output of the amplifiers, and to activate the speaker protection circuits
if the power exceeds the maximum safe operating area of the speaker. The Control Unit won’t turn on until you make
these connections.
CHANNEL A
CHANNEL B
ISC RETURNS
AC POWER
INPUT AND FUSE.
CHECK FOR
CORRECT
VOLTAGE
IN
FROM
CONSOLE
OUT TO
MID/HI
PROCESSOR
CH. A
OUT TO
IN
LOW
FROM
AMP IN CONSOLE
CH. A
OUT TO OUT TO
MID/HI
LOW
PROAMP IN
CESSOR CH. B
CH. B
ISC LEADS
FROM CH.
A&B
Pin configuration is Pins 1 and 2 - White (Channel A), Pins 3 and 4 Blue (Channel B), Pins 5 and 6 trigger a relay to
activate the Control Unit, and to turn it off if the leads are removed
• Connect both WHITE leads to the LOW amp Channel A outputs, and both BLUE leads to the LOW amp Channel
B outputs.
• Make sure you don’t get these mixed up - make sure that the Channel A ISC leads are connected to the Channel A
amplifiers, and Channel B leads to the Channel B amplifiers, or you will end up with the Channel A ISC
controlling Channel B and vice versa, which can give very strange results.
• Work slowly and carefully, and take the time to get it right. It’s a good idea to mark all leads as you go, so you can
visually check all connections before powering up.
NOTE: If your amplifier only has Neutrik Speakon output terminals, you will need to connect the ISC leads
to the speaker cables by splicing them into the speaker cable after the connector, or by making up a Y
connector, so thet one speakon goes to the ISC leads, and the other goes to the speaker cable.
Special Note for Early units
Early 118 processors used a 4 Pin XLR connector with different colour ISC leads: RED for Channel A, BLACK
for Channel B. So in the above instructions, substitute RED for WHITE, and BLACK for BLUE.
Also note that that inputs and outputs on early processors, in keeping with the accepted standards of the time,
were wired Pin 3 + (Hot), Pin 2 – (Cold), and Pin 1 Audio Ground
Pin configuration is Pins 1 and 2 - Red (Channel A), Pins 3 and 4 Black (Channel B)
Early ISC Speaker Processor Owner's Information - all models ©2004 ARX®
Part C - Passive Systems - CU303s, CU306, PowerPro, MicroPro
These systems use a passive crossover inside the speaker cabinet, and a single pair of ISC leads control each channel.
These leads allow the Control unit to monitor the output of the amplifiers, and to activate the speaker protection circuits
if the power exceeds the maximum safe operating area of the speaker.
Early Systems - Red and Black ISC leads
Both RED leads connect to the OUTPUT of Amp Channel A, in parallel with the speaker leads.
Both BLACK leads connect to the OUTPUT of Amp Channel B, in parallel with the speaker leads.
Both YELLOW leads connect to the OUTPUT of the SUB Amp, in parallel with the speaker leads.
Very early models had 4 Pin XLR connectors; later models had the ISC leads hard wired to the rear of the Control/Unit/
Processor
Note that early processors, in keeping with the accepted standards of the time, were wired Pin 3 + (Hot), Pin 2 – (Cold),
and Pin 1 Audio Ground
Later Systems - White and Blue ISC leads
Both WHITE leads connect to the OUTPUT of Amp Channel A, in parallel with the speaker leads.
Both BLUE leads connect to the OUTPUT of Amp Channel B, in parallel with the speaker leads.
Both YELLOW leads connect to the OUTPUT of the SUB Amp, in parallel with the speaker leads. The ISC leads are
hard wired to the rear of the Control/Unit/Processor
Check this wiring very carefully. Don’t get them mixed up, otherwise you will have the output of Channel A controlling
the input level of Channel B and vice versa.
NOTE: If your amplifier only has Neutrik Speakon output terminals, you will need to connect the ISC leads
to the speaker cables by splicing them into the speaker cable after the connector, or by making up a Y
connector, so that one Speakon goes to the ISC leads, and the other goes to the speaker cable.
System connection diagram
Early ISC Speaker Processor Owner's Information - all models ©2004 ARX®
Typical Specifications
CU212s
Input Impedance
Balanced 20 Kohms
Unbalanced 10 Kohms
Input Headroom
+21 dB
CMRR
>50dB, 20 Hz - 20 KHz
Output Impedance
150 ohms
Output Level (Max)
+20 dB
Filter Type
Linkwitz-Riley state variable
24dB per Octave
Frequency Response
20 Hz to 20 KHz.
Note: RFI filter -6dB 100KHz
Signal to Noise Ratio
-90dB Unweighted
-93dB A weighted
Distortion
.004% @ 0dB, 1 KHz
Dynamic Range
111dB
Input Connectors
Female XLR; Pin 1 Ground,
Pin 2 + (Hot)
Pin 3 - (Cold)
Output Connectors
Male XLR; Pin 1 Ground,
Pin 2 + (Hot)
Pin 3 - (Cold)
Power Requirements
220/240 - 100/120 V AC 50/60
Hz, 8 watts (8 VA)
Weight
5 lb/2.2 Kg
Dimensions
19"W x 1¾"H x 6"D
482 x 44 x 155 mm
CU118s
Input Impedance
Balanced 20 Kohms
Unbalanced 10 Kohms
Input Headroom
+21 dB
CMRR
>50dB, 20 Hz - 20 KHz
Output Impedance
150 ohms
Output Level (Max)
+20 dB
Filter Type
Linkwitz-Riley state variable
24dB per Octave
Frequency Response
200 Hz to 20 KHz.
Note: RFI filter -6dB 100KHz
Signal to Noise Ratio
-90dB Unweighted
-93dB A weighted
Distortion
.004% @ 0dB, 1 KHz
Dynamic Range
111dB
Input Connectors
Female XLR; Pin 1 Ground,
Pin 2 + (Hot)
Pin 3 - (Cold)
Output Connectors
Male XLR; Pin 1 Ground,
Pin 2 + (Hot)
Pin 3 - (Cold)
Power Requirements
220/240 - 100/120 V AC 50/60
Hz, 8 watts (8 VA)
Weight
5 lb/2.2 Kg
Dimensions
19"W x 1¾"H x 6"D
482 x 44 x 155 mm
CU912/9222s Specifications
Input Impedance
Balanced 20 Kohms
Unbalanced 10 Kohms
Input Headroom
+21 dB
CMRR
>50dB, 20 Hz - 20 KHz
Output Impedance
150
ohms
Output Level (Max)
+20 dB
Filter Type
Linkwitz-Riley state variable
24dB per Octave
Frequency Response
20 Hz to 20 KHz.
Note: RFI filter -6dB 100KHz
Signal to Noise Ratio
-90dB Unweighted
-93dB A weighted
Distortion
.004% @ 0dB, 1 KHz
Dynamic Range
111dB
Input Connectors
Female XLR; Pin 1 Ground,
Pin 2 + (Hot)
Pin 3 - (Cold)
Output Connectors
Male XLR; Pin 1 Ground,
Pin 2 + (Hot)
Pin 3 - (Cold)
Power Requirements
220/240 - 100/120 V AC 50/60
Hz, 8 watts (8 VA)
Weight
5 lb/2.2 Kg
Dimensions
19"W x 1¾"H x 6"D
482 x 44 x 155 mm
PowerPro
Input Impedance
20 Kohms electronically balanced
Maximum Input Level
+20dB
CMRR
>50 dB, @ 1 KHz
Output Impedance
300 ohms electronically balanced
Maximum Output Level +22dB
Signal to Noise ratio
90 dB, unweighted
Dynamic Range
110 dB
Distortion (THD)
.008% @ +4 dB, 1 KHz
Crossover Frequency
-3dB @100Hz (to SUB out)
HighPass Filters (-3dB point)
35 Hz SUB output
60 Hz A/B outputs
ISC Returns
Differential Inputs,
22 KOhms impedance,
hard wired to chassis
Input Connector type
Balanced 3 pin XLR
Output Connector type
Balanced 3 pin XLR
Power Requirements
100/120 - 220/240 V AC, 50/60
Hz, 8VA (8 watts)
Weight
5 lbs/2.2 Kg
Dimensions
19"W x 1¾"H x 6"D
482 x 44 x 155mm
It’s worthwhile noting that early
processors, in keeping with the
accepted standards of the time,
were wired Pin 3 + (Hot), Pin 2
– (Cold), and Pin 1 Audio Ground
However, older units may have
been modified by users to the
current Pin 2 + Hot standard as
listed here
Early ISC Speaker Processor Owner's Information - all models ©2004 ARX®
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