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I have a crazy weird subwoofer hum issue. Currently using a 12 year old Sunfire true subwoofer connected to a Denon AVR-3311 (had the same issue with my old Sony STR-DA30ES). The subwoofer is always connected and on and makes no hum. When I use it with quiet music it also doesn't hum. But when I play loud music or movies it starts a very loud hum. What's weirder is that I can get it to stop humming by flipping various wall switches. But the kicker is its always a different switch. My family room has three different wall switches (some are 3 way control) and when the sub starts humming I flip each one on and off again until it turns off. If a switch stops the hum one time it most likely will not the next, but one of the others will. The sub is plugged into its own outlet that is not connected to a wall switch. One time it was humming and my wife flipped on a light 3 rooms away and the sub stopped humming.
I have tried plugging the sub into its own power strip and it made no difference. Does anyone have any thoughts?
I have tried plugging the sub into its own power strip and it made no difference. Does anyone have any thoughts?