I've been trying (without success) to remove a slight hum in my system caused by my H/H AVR520 receiver. I've pretty much narrowed the cause of the problem to something with the electrical wiring in the house. It's definitely not a CATV ground loop, it still buzzes when nothing (other than speakers) are hooked up, and it's not the unit itself (had it checked out at an authorized service center). Would a power conditioner, possibly somethign like a monster HTS2600, help to clean up the incoming power and remove the hum? Or am i going to need to look into the wiring of the house to see what else is on the circuit that could be the source of the problem?