I have a Yamaha RX-V620 receiver. I have been noticing a noise coming through my two main speakers that sounds like "bacon frying". At first, I thought it was my speakers, then I ruled that out. Next, I thought it was my speaker cables, then I ruled that out. So, the only thing left was the receiver. And sure enough, that was the source of the problem. When I turn on the Effects, which cause the center channel and the surround speakers to come on, I hear the "bacon frying" noise coming through my two main speakers. However, when I turn the Effects off, the sound disappears. Do you have any idea why the Effects would be causing that and how much it would be to get something like that fixed?