I've got an Onkyo TX-SR606 that produces subwoofer hum. I've tried two different subwoofers with the same results. I've purchased new cables to connect the subwoofer to the receiver with no change in ...

I'm trying to figure out a way to deal with a ground loop problem I have at home, this is 60hz mains hum that comes out of speakers, even when nothing is connected to the device besides power cable. I ...