Rear Panel Features
AC Power Inlet
The 3 pin IEC power inlet is located on the bottom left of the rear panel and accepts a standard mains power lead fitted
with an IEC connector. Before plugging in a power lead, please check the rear panel of the amplifier to ensure that the
voltage label shows the correct AC operating voltage for your part of the world.
The inlet is equipped with an in-built AC fuse holder fitted with a 4 Amp slow blow fuse plus a spare fuse. Please ensure
that the mains power cord is disconnected before attempting to check or replace this fuse. Power consumption is 300
watts (max).
Speaker Output Terminal Strip
Located on the top left of the rear panel is the speaker output terminal strip. Reading from left to right, the connections
are:
COM
Common or “-” for low impedance speaker loads (4 or 8 ohms).
4
The “+” for 4 ohm speaker loads (use with common)
8
The “+” for 8 ohm speaker loads (use with common)
COM
Common or “-” for 70v or 100v speaker loads (maximum load of 80 ohms at 100v)
70
The “+” for 70v line speaker loads (use with common)
100
The “+” for 100v line speaker loads (use with common)
Please ensure that the correct “Common” is used. Low impedance and 70/100v loads can be used simultaneously but
please pay careful attention to the overall speaker load. When used individually, the low impedance load should be 4
ohms or higher while the 100v line load should not fall below 80 ohms. When both outputs are used simultanously,
ensure that neither output is loaded to maximum.
Level Control
Located to the left of the XLR input/output is a recessed screwdriver adjustable level control. The level control is an
input attenuation control normally used to match the amplifier to a wide variety of input signals. In essence, the amplifier
is designed to receive a 700mv input signal however the level control can be used to increase the level for lower signals
or decrease the level for higher input signals. In normal use, the level control is used as a ‘set and forget’ master level
control for the amplifier.
XLR Audio Input and Parallel Output
The ACM120P includes both male and female 3 pin XLR connectors. While the female is normally used as the input to
the amplifier, both XLR’s are connected in parallel so either will work. When signal is connected to one XLR, the other
XLR becomes a line level output allowing the input signal to be distributed (split) to other amplifiers. In some projects,
the same input may be looped through to multiple amplifiers using this method. Up to 6 amplifiers can be looped together
without any noticeable loss in level. A distribution amplifier should be used when more than 6 amplifiers need to be
looped.
The XLR’s are wired as follows: Pin 1: Shield. Pin 2: Hot, +, Positive. Pin 3: Cold, -, Negative
INPUT AM P 1
LEVEL 1
XLR
1 = Ground
2 = + Signal
3 = - Signal
ENGIN EERED BY AUDIO TELEX C OMM UN IC ATI ON S PTY LTD SYDN EY AUS TRALIA