Just sittin' there watchin' the news, and all of a sudden I hear this quietish 'hissssssssssssssss'. Looked at the misses, and she said 'hey, it wasn't me'. Upon closer inspection it was coming from my speakers. OK, must be garbage coming from the local broadcast. Let's change the station and see if it's still there. Still there. OK, must be garbage coming from my cable company (THERE'S a surprise!). Let's listen to a CD or AM/FM. Still there. Crap. This hiss is persistent as long as the volume is above OFF (which is -80 on my AVR). Goes away if I mute it (er, that would be OFF wouldn't it?). It does not get louder as I turn up the volume, so it's not being amplified (this part perplexes me). It's POST amplification? Changing the DSP modes do not affect whether the hiss persists or not. BUT, it does not occur when no surround modes are being used, so it seems to only be isolated to either the DSP section or the center channel amp section. So what is the problem? This never happened before. The unit is a Harman Kardon DPR2005. Got rid of an AVR7300 for this, now I'm thinkin' that was a bad move.