I think I may have a ground loop problem and I cant figure out a way to solve it. First let me start of by listing all of my components and what I am dealing with. Everything I have with the exception of my sub and amps is plugged into an APC H15 power conditioner. I have two independent lines run to the room directly from the breaker box. One of them is for my sub and everything else is on the other. My components include Emotiva XPA-2, XPA-5, ERC-1, USP-1, JL F112, Denon 3806, Direct TV DVR, PS3, and Panasonic PT-AX200U. It seems like whenever either the PS3 or projector is plugged in I get a buzzing out of the speakers. I have tried plugging them into the different filter banks on the APC but I cant get it to go away. Any ideas?