I've been noticing a strange buzz coming out of my left channel front speaker. It began about a week ago and though is fairly constant, it sometimes crackles and hisses a bit louder at times, all whether the volume is up or down. Also, upon power down, roughly 5-10 seconds after the system switches off a much louder steady buzz is now emitting from the speaker for about 5 seconds in duration, making me concerned that something has happened to the my 7125's left channel amp section. I plan on running the left channel through the Surround Back channel just to try and verify if it is indeed the Amp channel that's bad or possibly the speaker. Thoughts...