AUSTRALIAN MONITOR ACM604 Service Information - Page 5

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The various outputs are marked as follows:
C O M
Common or "-" for low impedance speaker loads (8 ohms).
8
Positive "+" for 8 ohm speaker loads (use with common)
C O M
Common or "-" for 70v or 100v speaker loads (maximum load of 160 ohms at 100v)
7 0
Positive "+" for 70v line speaker loads (use with common)
100
Positive "+" 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 8
ohms or higher while the 100v line load should not fall below 160 ohms. When both outputs are used simultaneously,
ensure that neither output is loaded to maximum.
VOX Muting
The ACM604 includes a VOX muting circuit which is independent for each amplifier. The unit is factory set so that input
1 of each amplifier has VOX priority over inputs 2 and 3 for that amplifier. Basically, when signal is present on input 1,
audio from inputs 2 and 3 is muted. As mentioned, each amplifier is totally independent so the VOX circuit from one
amplifier does not affect any of the other amplifiers.
Muting can be defeated per amplifier via an internal jumper labelled JP2 (located on the top board behind inputs 1 and
2. The ACM604 is shipped with muting enabled (jumper towards the front panel of the amplifier). To disable VOX muting
per amplifier, simply move the relevant jumper (from amplifiers 1, 2, 3 or 4) so that it is closest to the back panel.
Optional ATC5489 Tone Generator/Vox Relay Card
An optional Tone Generator/Vox Relay card is available for the ACM604. Each card suits one amplifier within the unit so
up to 4 cards can be installed. The card slots in between the input terminal strip and the output terminal strip on the rear
panel of the amplifier. Simply remove the two screws and blanking plate, slide in the ATC5489 and replace the screws.
The card provides a 4 tone generator module (Pre-Announce, Bell, Alert and Evacuate tones) per amplifier and also
provides a VOX triggered relay output per amplifier. Full installation and operation instructions are included with the
ATC5489.