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Thank you for the reply. If it is a ground loop, would it come and go? Would it stop when I turn the volume all the up and then back down? How do I fix a ground loop anyway?

The speaker is probably 15 years old. I have had it into the shop and have had all of the capacitors replaced. It worked well for a while after the capacitors were replaced, But now it is humming again. When it starts humming I can turn the volume all the way up and it will stop the home. I turn...