AUSTRALIAN MONITOR DCM250 User manual

250W AC/DC Power Amplifier
DCM250
Description
The DCM250 is a high performance 250 watt power amplifier designed to meet the needs of
the most demanding sound reinforcement installations and applications. The amplifier is
designed to operate from both AC mains power as well as 24 volts DC.
Inputs and Outputs
The DCM250 features a transformer balanced line level XLR input with a parallel output to
feed additional power amplifiers. The DCM250 provides 100 volt line and 4 ohm speaker out-
puts via a rear panel barrier strip.
Controls and Metering
The front panel consists of a mains power switch and a recessed, screwdriver adjustable input
attenuation control. The front panel of the DCM250 includes a back-lit LED display indicating
power, high temperature, LED VU meter and mains fail indication. The mains fail indicator will
only operate in the event of a mains power failure and when the amplifier is connected to a
24V DC power supply.
Protection
The DCM250 features overload and overdrive protection. Should the amplifier be overdriven,
a current limiter will protect the unit, and in a worst case scenario the amplifier will shut down
until the problem is resolved. Once the problem is fixed (shorted speaker line, or overdriven
input), the amplifier will automatically reset and continue operation. The amplifier also features
a built-in compressor/limiter designed to smooth out any peaks in input signal. The DCM250
features generous heatsinking and fan cooling. The fan will only switch on if the operating tem-
perature exceeds a factory preset level.
Australian Monitor Installation Series amplifiers feature a protection network that provides
greater stability and performance. Our amplifiers are recognised
worldwide for their reliability and this is due to the extensive levels of
current limiting which protect the amplifiers from both overload and
overdrive conditions.
Other Features
The DCM250 can operate from both AC and 24V DC and includes a built-in trickle charge
circuit.

Power Output 250 Watts RMS into 100V line or 4 Ohms
Maximum Load 40 Ohms @ 100V
Frequency Response 50Hz - 15kHz (± 3dB) into 100V
Total Harmonic Distortion Less than 0.5% @ 1KHz; Distortion at Max Power 0.7%
Signal To Noise Ratio -82dB
Input Sensitivity Max 300mV (set @ 1V)
Input Impedance 10K Ohms
Input Connection Transformer Balanced input with male and female XLR input/output sockets
Outputs 100 or 4 Ohm speaker outputs via a rear panel barrier strip. Line out to feed
additional power amplifiers available from 1 of the paralleled XLR inputs
Controls Front Panel Power Switch; Recessed front panel input attenuator
Metering/Indicators Amplifier Status Display Window including: Power On LED;
10 segment LED output meter; Mains fail LED; High temp trip LED
Power Sources AC: 240V - 50Hz or 110V - 60Hz (special order), 3 pin IEC connector;
DC: 24V with built in trickle charge circuit: 300ma maximum trickle charge.
15 Amp maximum current draw on DC, 300ma standby (idle) current draw on DC
Power Consumption 400 Watts (maximum)
Protection Internal Cooling Fan with temperature sensor
Compressor/Limiter Current Limiter with auto protect and auto reset
Dimensions/Weight 88mm H x 483mm W x 310mm D (Chassis dimensions only). 15 kg
Engineered and Distributed By AUDIO TELEX COMMUNICATIONS PTY LTD (ABN 78 001 345 482), 149 Beaconsfield Street, Silverwater, Sydney, NSW, 2128 Australia
NSW Tel: [phone] Fax: [phone] VIC Tel: [phone] Fax: [phone] QLD Tel: [phone] Fax: [phone] WA Tel: [phone] Fax: [phone]
TAS Tel: [phone] Fax: [phone] SA Tel: [phone] Fax: [phone] Export Enquiries: [email protected] Website: www.australianmonitor.com.au
ARCHITECTURAL AND ENGINEERING SPECIFICATIONS
The power amplifier shall be of high quality, suitable for the most demanding PA installations and appli-
cations. The unit shall have a frequency response of no less than 50Hz - 15kHz (±3dB). Distortion at
1kHz shall not exceed 0.5%. The Signal to Noise ratio shall be -82dB or greater. The amplifier shall have
two transformer balanced XLR inputs, one of which can be used to feed additional power amplifiers.
The amplifier shall be capable of delivering 250 watts RMS into 100 volt or 4 ohm loads. Speaker con-
nection shall be via a rear panel barrier strip.
The unit shall operate from both AC mains power or from a 24V DC battery supply. The amplifier shall
include a built-in trickle charge circuit. The amplifier shall feature overload and overdrive protection and
shall also include cooling fans, which should only be active if the operating temperature exceeds a fac-
tory preset level.
The unit shall be packaged in a rugged 2 RU metal chassis suitable for desk or rack mounting.
The power amplifier shall be an Australian Monitor Installation Series model DCM250.