AUSTRALIAN MONITOR ACM604P User manual

ACM604P
4 x 60w Power Amplifier
Operating Manual

ProductDescription
The ACM604P is a four channel (4 x 60w) power amplifier designed for commercial installations. The one unit contains
four independent 60 watt amplifiers for multi-zone applications. The ACM604P can be used for either low impedance (8
ohm)or70v/100vlinespeakersystemsperchannel.Theamplifiercanbemountedinastandard19”equipmentrack(rack
ears supplied) or it can be used on a shelf or table. The ACM604P features a line level input (with parallel output) per
channelandis normally used with mixers, mixer amplifiers or other power amplifiers.
ACM604P, 4 x 60 Watt Power Amplifier
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
LEDwillilluminate.
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’s located next to the On LED indicate that the ACM604P is receiving audio signal via its line
level inputs. One LED is provided per channel. The signal LED’s are a simple way of trouble-shooting installations
especially in multi amplifier projects. At a glance the signal LED’s will indicate that audio is reaching the amplifier.
Rack Mounting
The ACM604P 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 ACM
amplifiers within the one rack, it is recommended that at least 1 rack unit of ventilation space is left between every two
amplifiers.
For table or shelf mounting, the rack ears can be removed using a screwdriver. Once the rack ears are removed, please
reinstall the screws.

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 5 Amp slow blow fuse plus a spare fuse. Pleaseensure
thatthemainspowercordisdisconnectedbeforeattemptingtocheckorreplacethisfuse. Powerconsumptionis400
watts(max).
Speaker Output Terminal Strip
Located on the top half of the rear panel are the speaker output terminal strips. A terminal strip is provided for each of
the four amplifiers. Reading from left to right, the connections per terminal strip are:
COM Common or “-” for low impedance speaker loads (8 ohms).
8The “+” for 8 ohm speaker loads (use with common)
COM Commonor“-”for 70v or 100v speaker loads (maximum load of 160 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 8
ohms or higher while the 100v line load should not fall below 160 ohms per amplifier. When both low impedance and 70/
100v outputs are used simultaneously on the one amplifier, ensure that neither output is loaded to maximum.
Level Control
Located next to the XLR input/output is a recessed screwdriver adjustable level control. One is provided per amplifier
channel. 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 Audio Input and Parallel Output
The ACM604P includes both male and female 3 pin XLR connectors per channel. While the female is normally used as
theinput to the amplifier, bothXLR’s are connected in parallel so eitherwillwork.Whensignal is connected to one XLR,
the other XLR becomes a line level output allowing the input signal to be distributed (split) to other amplifiers. In some
projects,thesameinput may be looped through to multiple amplifiers using this method. Up to 6 amplifiers can be looped
together without any noticeable loss in level. A distribution amplifier should be used when more than 6 amplifiers need
to be looped.
The XLR’s are wired as follows: Pin 1: Shield. Pin 2:Hot, +, Positive. Pin3:Cold, -, Negative

1.Savethecartonandpackingmaterialeveniftheequip-
ment has arrived in good condition. Should you ever
need to ship the unit, use only the original factory pack-
ing.
2.Readalldocumentationbeforeoperatingyourequip-
ment.Retain all documentation for future reference.
3. Follow all instructions printed on unit chassis for
proper operation.
4.Donotspill waterorotherliquidsintoorontheunit,
or operate the unit while standing in liquid.
5. Makesure power outlets conformto the power re-
quirements listed on the back of the unit.
6. Do not use the unit if the electrical power cord is
frayed or broken. The power supply cords should be
routed so that they are not likely to be walked on or
pinched by items placed upon or against them, paying
particular attention to cords and plugs, convenience re-
ceptacles, and the point where they exit from the
appliance.
7. Always operate the unit with the AC ground wire
connected to the electrical system ground. Precautions
should be taken so that the means of grounding of a
piece of equipment is not defeated.
8.Mainsvoltagemustbecorrectandthesameasthat
printed on the rear of the unit. Damage caused by
connection to improper AC voltage is not covered by
any warranty.
9.Havegaincontrolsonamplifiersturneddownduring
power-up to prevent speaker damage if there are high
signal levels at the inputs.
10.Powerdown&disconnectunitsfrommainsvoltage
beforemakingconnections.
11.Neverholdapowerswitchinthe“ON”positionifit
won’tstaythereitself!
12.Donotuse the unit nearstoves,heat registers, ra-
diators,orotherheat producingdevices.
13. Donotblockfanintakeor exhaust ports.Do not
operate equipment on a surface or in an environment
which may impede the normal flow of air around the
unit, such as a bed, rug, weathersheet, carpet, or com-
pletelyenclosedrack.Iftheunit is used inanextremely
dusty or smoky environment, the unit should be peri-
odically “blown free” of foreign matter.
14. Donotremovethecover. Removing the coverwill
expose you to potentially dangerous voltages. There
are no user serviceable parts inside.
15.Donot drivetheinputswithasignallevelgreater
thanthatrequiredtodriveequipmenttofulloutput.
16. Donotconnecttheinputs/outputsofamplifiers
or consoles to any other voltage source, such as a
battery, mains source, or power supply, regardless of
whether the amplifier or console is turned on or off.
17. Donot run the output of any amplifier channel
backintoanotherchannel’sinput.Donotparallel-or
series-connect an amplifier output with any other
amplifieroutput.
Audio Telex Communications Pty Ltd is not respon-
sible for damage to loudspeakers for any reason.
18. Donot ground any red(“hot”) terminal. Never
connecta“hot”(red) outputtogroundorto another
“hot”(red)output!
19. Non-use periods. The power cord of equipment
should be unplugged from the outlet when left un-
used for a long period of time.
20.ServiceInformationEquipmentshouldbeserviced
by qualified service personnel when:
A. The power supply cord or the plug has been
damaged.
B. Objects have fallen, or liquid has been spilled into
the equipment
C. The equipment has been exposed to rain
D.Theequipmentdoesnotappeartooperatenormally,
or exhibits a marked change in performance
E. The equipment has been dropped, or the enclosure
damaged.
Important Safety Information

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