Australian Monitor ACM250P User Manual

ACM250P

250w Power Amplifier

Operating Manual

ONSIGNALPROTECT

POWER

ACM250P, 250 Watt Power Amplifier

Product Description

The ACM250P power amplifier is designed for commercial installations. It can be used for either low impedance (4 ohm)
or 70v/100v line speaker systems. It operates on 230/240 V AC, 50Hz (or 1 15 VAC, 60Hz with factory modification) and
may be desk or rack mounted. The ACM250P features a line level input (with parallel output) and is normally used with
mixers, mixer amplifiers or other power amplifiers. The ACM250P delivers 250 watts into a load of 4 ohms, 70 or 100 volt
line.

ONSIGNALPROTECT

POWER

Front Panel Features

Power Switch

The black rocker switch on the right hand side of the front panel is used to switch the amplifier on and off. The ‘up’
position is on. When the amplifier is connected to an appropriate AC power source and is switched on, the blue power
LED will illuminate.

On LED

The blue “On” LED above the power switch will illuminate when the amplifier is connected to mains power and is
switched on.

Signal LED

The green “Signal” LED located next to the On LED indicates that the ACM250P is receiving audio signal via its line
level input. The signal LED is a simple method to trouble-shoot installations especially in multi amplifier projects.
At a glance the signal LED will indicate that audio is reaching the amplifier.

Protect LED

A feature of the ACM250P is high temperature protection. In most applications, the internal cooling fan will most
probably never switch on. When used with demanding speaker loads or in difficult operating environments, the fan may
regularly switch on to cool the amp down and then switch off again. This switching on and switching off is quite normal.
The “Protect” function is there to protect the amplifier from a high temperature problems which would only occur if the
fan stopped working or became clogged up. In this very rare occurance, the protect LED will illuminate and the amplifier
may shut down. The amplifier will automatically restart once it’s internal temperature has fallen within “safe” limits. If the
protect LED illuminates, it is best to switch the amplifier off, let it cool down and then try it again. If the protect LED
illuminates again, please contact the company who supplied or installed the equipment.