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.
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.
AC POWER
INPUT AND FUSE.
CHECK FOR
CORRECT
VOLTAGE
CHANNEL A
CHANNEL B
ISC RETURNS
IN
FROM
CONSOLE
OUT TO
MID/HI
PRO-
CESSOR
CH. A
OUT TO
LOW
AMP IN
CH. A
IN
FROM
CONSOLE
OUT TO
MID/HI
PRO-
CESSOR
CH. B
OUT TO
LOW
AMP IN
CH. B
ISC LEADS
FROM CH.
A&B
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)
