Hi, I have a Sony sub and am getting a loud buzzing after switching it on. Thought it might something causing interference so tried various positions/sockets around the room. Still getting the buzzing so disconnected the coax from amp end and buzzing still there, disconnected from subwoofer end and buzzing stopped. Problem whenever any coax is inserted into the subwoofer (even without the other end connected) loud buzzing occurs. Any help/advice appreciated. Thanks John.