I have a yamaha 2700 and it is only about 3 feet away from me and I can hear buzzing/whining coming from the receiver itself and not the speakers. It reminds me of the buzzing I hear from many plasma TVs. Is this a power supply issue? should I be worried? The Yamaha itself works fine and I have not had any issues with it (except the buzzing) Do all receivers make some noise? Am I just too close to it. Also it is raised on a shelf above ear level. It is plugged into a surge protected power bar.