Product Description
The DCM120 is a 120 watt power amplifier designed for commercial installations. It can be used for either low impedance
(4 or 8 ohm) or 70v/100v line speaker systems. The amplifier can be mounted in a standard 19” equipment rack or it can
be used on a shelf or table. The DCM120 features a line level input (with parallel output) and is normally used with mixers,
mixer amplifiers or other power amplifiers. The DCM120 will operate from 230/240 VAC @ 50 Hz (115 VAC @ 60
Hz with factory modification) or 24 VDC and will meet its full performance specification on either voltage supply.
The DCM120 also features a DC battery trickle charge facility, auto-sensing fan cooling, plus overload, short circuit
and over temperature protection.
DCM120, 120 Watt Power Amplifier
Front Panel Features
Power Switch
The rocker switch located in the front centre of the panel turns AC power on to the DCM120. Rocking the power switch
to the right to turns the AC power ‘on’. When the AC power is ‘on’, a blue LED will glow. Please note that this switch
does not switch DC voltage. If a DC voltage supply is connected to the DCM120, the amplifier will operate as soon
as the connection is made, regardless of the position of the AC power switch. If both an AC and DC voltage supply are
connected and you rock the AC power switch to the ‘off’ position, the DCM120 will automatically continue to
operate normally from the DC supply (and the ‘mains failure’ LED will also glow under these conditions).
Level Control
The output level control is located in the centre of the front panel, just to the left of the mains rocker switch (re-
cessed screwdriver adjustable pot). Turning the control clockwise will increase the output of the DCM120 towards
it’s maximum output level while turning the control counter-clockwise will decrease the output level. Adjust this
control for the desired output level depending on the level of the input signal (from a mixer or other signal source).
The factory default setting for this control is such that a 1 volt input will give a 100 volt output.
Amplifier Status Display
The amplifier status display highlights the operating condition of the DCM120. The status display indicates:
High Temperature: This red LED glows if the fan has failed and the amplifier has been shut down by its temperature
control circuitry. If this LED is glowing and the fans have not failed, it means that the amplifier is operating in an ambient
environment that is too hot for fan cooling to make any difference to the temperature of the amplifier.
Power: This LED glows blue if AC power is switched on to the DCM120. Note that this LED does not indicate the
presence of a DC supply voltage.
T EM P
FA IL
O N 2 4 2 1 1 8 1 5 1 2
9
6
3
0
+ 3
H I
M A IN S
D C M 1 2 0
