I've got a 755 and some homemade CAT5e plenum cables, biwire. I can hear hiss from my listening position in a very quite room, my wife says I hear things no one else could possible hear, but it's really only noticible from about 2-3 ft from tweeter. I've heard more hiss from way more expensive gear in demo rooms, not that it was acceptable...I've got a red-dot unit and after a couple of weeks of use it actually hissed more than my original 950 from May. I'm enjoying the hell out of the 950/755 combo, add the Vandersteens and a good DVD-A/SACD and all I can say is wow. I'm watching, err listening to Lord of the Rings right now, wow mega sound!