Australian monitor AMC60W, ACM60, AMC120, AMC-120W User Manual

ACM60, 60w Mixer Amplifier

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ACM120, 120w Mixer Amplifier

Operating Manual

ACM60, 60w Mixer Amplifier

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ACM120, 120w Mixer Amplifier

Product Description

The ACM60 and ACM120 mixer amplifiers are designed for commercial installations. Both models operate on 230/240
VAC, 50Hz (or 115 VAC, 60Hz with factory modification) and may be desk or rack mounted (rack mount kit supplied
fitted). Both amplifiers incorporate a 6 zone 100 volt line speaker zone selector with all call. The ACM60 will deliver 60
watts into a load of 8 ohms, 70 or 100 volt line. The ACM120 will deliver 120 watts into a load of 4 or 8 ohms, 70 or 100 volt
line. As standard, both models are self standing and come with rubber feet. They may be stacked to a maximum of four
units high.
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Front Panel Features

(ACM120 shown. The ACM60 has identical front panel features)

Microphone/Line Level Controls

The 4 dual mic/line input controls are labelled Ch 1 through to Ch 4 and should be adjusted to provide the required level
mix for each individual channel. Start with the controls set to level 0 and turn the controls clockwise until the desired mix
level for each channel is reached.

Bass Control

Setting this control in the centre position will give an overall flat bass response. Adjusting the bass control in a
clockwise direction will provide up to 12 dB of bass boost @ 100 Hz. Adjusting the bass control in a counter-clockwise
direction will provide up to -12 dB of bass cut @ 100 Hz. It is recommended to start with the bass control at the centre (0)
position and adjust if necessary.

Treble Control

Setting this control in the centre position will give an overall flat treble response. Adjusting the treble control in a
clockwise direction will provide up to 9 dB of treble boost @ 10kHz. Adjusting the treble control in a counter-clockwise
direction will provide up to -9 dB of treble cut @ 10 kHz. It is recommended to start with the treble control at the centre
(0) position and adjust if necessary.

Master Output Control

The master level pot controls the overall output level of the amplifier depending on the levels set for the individual input
channels as detailed above. Start with the control set to level 0 and turn clockwise until the desired output level of the
amplifier is reached.

Page Chime Enable Button

This allows the user to disable or enable the Pre-Announce Chime. This switch does not however activate the chime.
Activation is accomplished via the rear panel barrier strip (normally wired to a paging microphone). If the pre-announce
chime is connected to a paging microphone (meaning that it would be activated by the switch on the microphone), the
Page Chime Enable switch on the front panel of the amplifier allows the user to disable the chime function for those
occasions when it is not wanted.

All Call Button

When pressed, the All Call button will connect the 100 volt output of the amplifier to all 6 of the switched outputs (if
connected). Depressing this button again will disconnect the switched outputs. This switch is “push on-push off” and
is non-interlocking.

Speaker (Zone) Selector Switches

These 6 black buttons are for switching the 100 volt output of the amplifier to any combination of the 6 available speaker
zones. The switches are “push on-push off” and are non-interlocking (both with each other and with the all-call button).
The maximum capacity of each speaker zone is 60 watts so care should be taken to ensure that no individual zone is
loaded down with any more than 60 watts, always remembering that the total load for the ACM60 is 60 watts and for the
ACM120, 120 watts in total. Eg; It is possible on the ACM120, for example, to safely have one zone loaded with 60 watts
and the remaining five loaded with 12 watts each.

Power Switch

This switch controls the switching of AC power to the amplifier. Rocking this switch upwards turns on AC power to the
amplifier while rocking the switch downwards turns power off to the amplifier . A blue LED above the switch will indicate
whether the amplifier is switched on or off.

Rear Panel Features

(ACM120 shown. The ACM60 has identical rear panel features)

230V/240V Slide Switch

The operating voltage of the amplifier is user selectable between 230V and 240V via a slide switch located on the top left
side of the rear panel. This switch should be set to match the AC voltage of your country.

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 switch is set correctly for your part of the world.

The operating voltage is 230/240 V AC @ 50 Hz or 1 15 V AC @ 60 Hz with factory modification. The inlet is equipped with
an inbuilt AC fuse holder fitted with a 4 amp fuse (ACM120) or a 2 amp fuse (ACM60) plus a spare within the holder.
Power consumption is 125 watts for the ACM60 and 250 watts the ACM120.

---- Please ensure that the mains power cord is disconnected before attempting to check or replace this fuse----

Speaker Output Terminal Strip

The screw terminals on the left hand side of the strip allow access to the direct speaker outputs of the amplifier. The
screw terminals on the right hand side are for activation of the in-built 4 tone generator. Reading from left to right the
terminals are:

Low Impedance Common (use with 4 or 8 ohms)
4 Ohms (not available on ACM60)
8 Ohms
Constant V oltage Common (use with 70v or 100v)
70 V olt Line
100 V olt Line
Spare