Question about M&K Sound Mp Series MX-350 MK II THX Subwoofer

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M&K series mx200 subwoofer humming

Just started humming over night im guessing a short in the amp, but since they are out of business i cant find a schematic for their amp to check what may be shot.
any suggestions?? thanks, Andy

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There are a couple of possibilities. The first one is just moving the ac cord that goes to the power supply away from the board by tucking it into the insulation. The other is you may have a bad (oscillating) STK- 4050 output IC which is availabe from MCM electronics. The power supply caps may also need to be replaced.

Posted on Mar 08, 2009

  • John Mansour-Dumas Sep 09, 2014

    Also, the humming could be caused by the op amps which can be changed to TL064's

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