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I'm trying to figure out what is causing the hum in my subwoofer and guitar amp in my basement and I think it might be something going on with the wiring. I don't know much about ground loops but I have one subwoofer that has hum when I plug in the signal cable to it and my guitar amp has significant hum when I use the effects loop on it. The reason I think it might not be these two devices is because other people have them that I've talked to that don't have the same humming problems, especially the guitar amp.

Do you have any tips on what I should look for to fix this issue? I wired the basement up 4 years ago with outlets and not sure what I could have done wrong with it to cause this humming noise in some audio equipment. The weird thing is that it doesn't happen in every speaker I have (thank god), just the subwoofer and guitar amp probably because they have amplifiers themselves.
 

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