Question about M&K Sound Mp Series MX-350 MK II THX Subwoofer
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
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
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See page E1 regarding placement and safety.
Page 44 - read about "humming".
If you have hum on the sub, is it there with and/or without the input cable attached?
Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.
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