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Home subwoofer amp hum?

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rmitch47

New Member
Hello all and I like the forum, thank you! Anyway I have a 400 watt home powered sub and lately I have been getting a hum, it increases when gain is increased! Weird thing is, it has the same hum even when it isnt connected to my receiver. I already tried changing the 3 prong plug to 2 prong plug thinking it was ground hum, but it wasnt that. Im thinking its a cap letting ac through, I was wondering what ppl thought. Again thank you, rmitch47
 

audioguru

Well-Known Member
Most Helpful Member
Maybe its input cable has a broken or missing shield.
Maybe a filter capacitor in its power supply has failed.
 

crutschow

Well-Known Member
Most Helpful Member
If the hum is there with no audio input cable connected, then I suspect a power supply filter or decoupling capacitor has failed.
 
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