Question about Wharfedale PowerCube PC-12 Subwoofer

1 Answer

Loud steady sound when turned on

Dear Experts,

I had this problem with my PC-12 recently... upon switching the power on, there are some hissing sound for about 2~3 sec then the steady loud roar will reproduced afterwards. The loudness cannot be controlled by the volume and even though there are no inputs to the sub, this problem still persists. Is my PC-12 grounded or any of the transistors / capacitors gave in? Pls advise on how to troubleshoot this problem.

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  • manoyski Dec 16, 2007

    Yes, it's the humming noise thing.



    How can I check which power supply capacitor failed using a multimeter?

  • Anonymous Feb 07, 2008

    I'm having exactly the same problem - any tips on diagnosis and fixing this?

    With a circuit diagram i could start to get on my way i think - not sure if any exist?

  • xsimel Apr 10, 2008

    The same problem here, as soon as I plug the power that loud roar starts right away. I once took the whole sub-woofer apart and assembled the whole thing again and it worked as a charm for ten days or so, and it started all over again. So i think it's a capacitor thing but I'm no expert, if any one knows a solution it would be nice to know.

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1 Answer

If it's a humming noise you are describing, then it may be that one of the power supply filter capacitors has failed. Of course it could be some other sort of power supply problem as well.

Posted on Dec 16, 2007

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