ACM604, 4 x 60 Watt Mixer Amplifier
Product Description
The ACM604 is a 4 x 60 watt mixer amplifier designed for commercial installations. It features 4 independent 60 watt mixer
amplifiers within the one 2 rack unit chassis. Each amplifier features 3 balanced microphone/line input channels and
outputs for either low impedance (8 ohm) or 70v/100v line speaker systems. A host of unique features including VOX
muting, VCA master level control and optional tone generator/VOX relay cards make the ACM604 a very flexible
amplifier. The unit can be mounted in a standard 19” equipment rack (rack ears supplied) or it can be used on a shelf or
table.
Front Panel Features
Input Level Controls
The front panel is split into 4 sections, one for each mixer amplifier. The level controls for each amplifier are labelled MicLine 1 through to Mic-Line 3. These level controls are used to set up a suitable “mix” of all the various input sources
connected to each amplifier, for example microphones, CD players, cassette decks. If a master level control is desired per
amplifier, an external 500-1K ohm pot can be connected (per amplifier) to the rear panel for remote control of the master
level of each amplifier.
Bass Control
Each amplifier within the ACM604 includes a recessed, screwdriver adjustable 2 band equalisation system. The Bass
control allows the user to increase or decrease the amount of bass in the system. The control allows for 12dB of cut or
boost at 100Hz. If no bass cut or boost is required, the control should be left in the centre position.
Treble Control
Each amplifier within the ACM604 includes a recessed, screwdriver adjustable 2 band equalisation system. The Treble
control allows the user to increase or decrease the amount of treble in the system. The control allows for 9dB of cut or
boost at 10kHz. Generally, a small increase of the treble control makes a system sound ‘brighter’. If no treble cut or boost
is required, the control should be left in the centre position.
VCA Master Control
For applications requiring remote level control, provision has been made on the rear panel of the ACM604 to connect an
external 500-1K ohm pot for remote control of the master level of each amplifier.
Power Switch & “On” LED
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 on LED
will illuminate.
Signal LED’s
The four green “Signal” LED’s located next to the On LED indicates that the ACM604 is passing audio. One LED is
provided per amplifier. The signal LED is a simple method to trouble-shoot installations especially in multi-amplifier
projects.