Question about Jmlab Electra 905 Speaker

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I have a pair of JM lab Electra 905 speakers, running through a DNM amp and power amps. When powered up, the left speaker makes a very loud humming noise. This has happened recently. I haven't changed anything. When I play a CD, the humming noise remains. When I turn the volume up, the left speaker makes a loud banging noise. Help! I suspect the left power amp is faulty. Any ideas?? Thanks.

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Hello
Switch on your amp, keep its volue down to extreme low, and listen if there is still hum through the left channel or not. If still there is hum, the left side power amplifier section inside the amp;ifier is faulty. If htere is no hum at this state, hum enters thorugh the audio input terminal, and the input wires must be checked for open sheild connection. OK.

Posted on Apr 10, 2011

  • rossglamont Apr 11, 2011

    Thanks gopakumarg, most helpful. Came to the conclusion it's probably a capacitor that's over-heated in the left pre-amp. Off to repair shop. Thanks again.

  • The Knight
    The Knight Apr 11, 2011

    Ok. Good Luck

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