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  1. #1
    AR Member JeffKnob's Avatar
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    Soundstream M-1 humming noise

    My friend just gave me 5 Soundstream M-1 monoblocks for free because they were just taking up room in his house. At this time I was only going to use two of them to power my two passive subwoofers in my bedroom. I connected them to the subwoofer out on my Pioneer receiver. When I turned them on I got a humming noise coming from the subwoofers. Does anybody have any suggestions on how to eliminate this?
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^
    Onkyo TX-SR606
    PS3 Bluray
    Denon DVD-1920
    Panasonic TH-50PZ80U Plasma
    HR21 HD DVR
    Paradigm Esprit (front), Focus (rear), CC270 (center)

    2 - 15" Dayton HF subwoofers
    Two Soundstream M1 monoblock amps for the subwoofer

  2. #2
    Suspended markw's Avatar
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    Noo Joisey. Youse got a problem wit dat?
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    Is that hum in lieu of the signal or with it?

    If the hum is all you get, there is some deeper problem than I can offer assistance on.

    But, if it's a background hum along with the correct signal, I'd vote for it being a grounding problem. You might try switching outlets, perhaps to one on the same circuit as the receiver. If it's a grounded (three prong) plug on the amp, you might try using a cheater plug to lift the ground, although you do this at your own risk.

    I'm sure others wil lfollow up with more sugestions.

  3. #3
    AR Member JeffKnob's Avatar
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    I have the two amps plugged into the same surge protector as the receiver. I will have to double check whether there was any of the correct signal coming through.

    What sort of problem can occur if I were to use a cheater plug?

  4. #4
    AR Member JeffKnob's Avatar
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    Quote Originally Posted by markw
    If the hum is all you get, there is some deeper problem than I can offer assistance on.

    But, if it's a background hum along with the correct signal, I'd vote for it being a grounding problem. You might try switching outlets, perhaps to one on the same circuit as the receiver. If it's a grounded (three prong) plug on the amp, you might try using a cheater plug to lift the ground, although you do this at your own risk.

    I'm sure others wil lfollow up with more sugestions.
    I have put the cheater plug in and the hum has gone away. Now there is only the sound I want. Am I at any risk by putting this plug inline?

    In case it helps, I have found out that these amps are very similar to the Parasound HCA-1201A. The specs are identical, the back is identical, but the front is a little different.

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