Question about Wharfedale PowerCube PC-10 Subwoofer

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Wharfedale 10inch cude subwoofer that has a feedback hum when con

I have a Yamaha amp and all the speakers work fine. Added the above speaker. No hum whem only connected to the power supply but as soon as it is connected to the amp a low hum starts. Speaker appears to work fine but the hum is apin. Anu advice would be great.

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  • vandergoot Jul 16, 2009

    Thanks Ganx. I have tried different leads Checked the fuses etc but the hum is still there. I dont want to disconnect the earth lead. It only hums when it is connected to the amp. Have also tried it on a friends amp does the same thing on his. The amp is a Yamaha.

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Hiya, try a different input cable (from amp to sub) if you have make sure that is ok.

Failing that if there is an earth in the plug, try to disconnect that (earth loop) - unlikely but hey electronics.... anything possible :)

If still there with new cable, earth off etc, then the Yamaha could have a problem but find that difficult to swallow...

Let me know if helps, see any other possibilty
Best of luck

Posted on Jul 14, 2009

  • Garth Urie
    Garth Urie Jul 26, 2009

    Hi vandergoot,

    It really does sound like an earth loop issue, especially if its doing the same on another amp.

    If you not happy about disconnecting the earth, the try leaving the earth free on the input cable. Test it by putting a pin/clip or something to the centre ring of the input and only touching the tip of the rca plug. That way the earth is off. If it sounds much better, then it is an earth problem, you may not have a choice but to disconnect the main earth from plug

    The other possibility is that the earth on the sub is not connected correctly. Try earthing the outside ring of the RCA while its all plugged in to any metal screw etc just with a short piece of wire.

    Not ideal ways either way but might get lucky. If it doesnt help, will have to go in. Probably not to serious (broken track/loop) so should be fine but get a quote first!

    Best of luck


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What type of amp is it

Posted on Jul 14, 2009

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