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 6 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 consump-
tion is 400 VA (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 connec-
tions are:
COM
Common or “-” for low impedance speaker loads (4 ohms).
4
The “+” for 4 ohm speaker loads (use with common)
COM
Common or “-” for 70v or 100v speaker loads (maximum load of 40 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 40 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
1 = Ground
2 = + Signal
3 = - Signal
ENGIN EERED BY AUDIO TELEX C OMM UN IC ATI ON S PTY LTD SYDN EY AUS TRALIA
INPUT
GAI N
DC FUSE
10 A SB
For table or shelf mounting, the rack ears can be removed using a screwdriver. Once the rack ears are removed, please
reinstall the screws.
Rack Mounting
The ACM250P is supplied with rack ears attached to allow mounting within a standard 19” equipment rack. As is the
case with almost all audio products, adequate ventilation and air flow is required. When installing multiple ACM250P
power amplifiers within the one rack, it is recommended that at least one rack unit of ventilation space is left between
every two amplifiers.
