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Architect's and Engineers' Specifications
The Amplifier shall be a constant voltage 100 Volt type, containing four independant controllable amplifier channels with an output power
of 4 x 240 Watt. The construction shall be transformerless, using Class-D Amplifier technology and powered by a switching power supply.
Each channel shall have integrated circuitry to protect against short-circuits or mismatched loads and over-heating. The operating
temperature for each channel shall be continuously monitored and a speed-controlled fan will keep it within the operating range while
minimising the acoustic noise. Additionally, the load shall be protected against DC faults and a clip limiter shall automatically reduce the
input gain at onset of distortion.
The front panel shall contain an AC power switch accompanied by a blue power indicator LED and channel operation indicator LED's. Two
green signal LED's indicating the presence of an input signal and it's level exceeding the -20 dB level, a clip LED indicating the channel
operation at maximum level and a protection LED indicating any fault detected shall be provided for each channel.
All connections shall be made on the rear panel of the unit. The signal input connections shall be balanced and performed using female
XLR connectors with male XLR connectors allowing signal link through to other channels or amplifiers. A gain control potentiometer shall
be provided to adjust the input sensitivity within a range of -0.5 dB to 10.5 dB, and a switch shall allow the enabling / disabling of a high-
pass filter with a roll off frequency of 400 Hz.
The output connections shall be performed using 4-pin Terminal block connectors, allowing connectivity of multiple loudspeaker lines on
one amplifier channel.
The amplifier shall operate on a 230~240 V AC / 50 Hz mains network and shall be equipped with a removable power cord having a
standard shuko (CEE 7/7) AC plug. The connector on the amplifier chassis shall be a fused IEC C14 type.
The amplifier chassis shall be a two rackspace steel constructed 19'' housing. Depth from mounting surface to rear supports shall be 420
mm and the weight shall not exceed 8.35 Kg.
Block diagram
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