Studiomaster Professional DJA2500 - Page 23

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- Load connected to Bridge connector with load as specified.
- Channel 1 control MAX.
- Bridge mode selected from the Back Plate mode selection switch.
Power Output
(V)
Load
150V
8 Ω
4) SIGNAL TO NOISE LEVEL MEASUREMENT:
- Connect the Amplifier in Stereo Mode with 4 Ω loads.
- Check the output power level with the given frequency filters and observe the readings for both the
channel.
- Noise should be less than 2mV
5) LIMITER TEST:
- Output is set to 82V with rated sensitivity input in 4ohm load.
- Increase input to 4Vand keep the CH pot max.
- Output should be about 85V
6) LOW CUT MEASUREMENT:
- Connect the amplifier in stereo mode with 4Ω loads at 1 kHz.
- Feed input to Left channel at rated sensitivity and Set output to 30 V in 4Ω loads using gain control
pot.
- Drive single channel, Put the switch @ the rear into low-cut mode
- Using the XO control at the rear set the required frequency. Following are the frequencies at which
output is about 21V(+/-1V).
FREQ FREQ Variation
43Hz +/-5Hz
63Hz +/-5Hz
120Hz +/-10Hz
140Hz +/-10Hz
180Hz +/-25Hz
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7) SUBWOOFERMEASUREMENTS
- Connect the amplifier in stereo mode with 4Ω loads at 1 kHz.
- Drive single channel, Put the switch @ the rear into subwoofer mode
- Feed input to Left channel at rated sensitivity and Set output to 30V at 10Hz @ 4Ω loads using gain
control pot.
- Using the XO control at the rear set the required frequency. Following are the frequencies at which
output is 21V(+/-1V).
FREQ FREQ Variation
43Hz +/-5Hz
63Hz +/-5Hz
120Hz +/-10Hz
140Hz +/-10Hz
180Hz +/-25Hz
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8)
EQ processing measurements:
- Connect the amplifier in stereo mode with 4Ω loads at 1 kHz.
- Feed input to Left channel to get output of 15V at 100Hz
- Turn the EQ Processing switch ON.