SOURCE: loud humming buzzing sound coming from subwoofer
make sure you have the speaker connection right if you do then it is a ground problem try plugging it in a different outlet
SOURCE: Sub Hum
Was not clear .....does the sub have audio output
If not the preamp circuit is bad and this will cause the hum as well
SOURCE: Loud humming sound from subwoofer
just try leaving it unplugged for a while thats what i did and it fixed it
SOURCE: Loud hHum from Subwoofer
Sounds like the hum might be mains hum caused by the failure of the power supply capacitor(s) in the sub. It/they will be the largest on the pc board. You will find all the details (needed to replace it) on them. If you find more than one replace both.
SOURCE: klh subwoofer asw12 200 powers on but no sound,
There's an amp inside the unit, most likely the semicondutor that does all the work has failed in it.
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