Quote:
They are both dead quiet

My 990/7500 system is also dead quiet 99% of the time, also...as noted in some other posts, that other 1%, I believe is from a source (power grid/distribution CO.)out of my control. I went thru the gambit with Outlaw support back when I first purchased equip., never could figure it out. It usually happens right around "supper time"; don't do much listening then, anyways.

As an aside, I don't use any power conditioning (wonder if it would help?), just high caliber surge protection.
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Anthem MRX-500/ Outlaw 7500, Paradigm Studio 100's Fronts, Paradigm CC-590 Center, Phase Technology Dipole rears , Martin Logan Dynamo sub, Oppo BDP-103, DIRECTV H22-200 DVR HD receiver, Samsung PN60E8000 3D Plasma 60"
2nd System
B&K ST 202 Amp, Outlaw 990, Rotel RCD 1072CD, Yaqin CD 1 Tube Buffer, Apogee Centaur Minors, Phase Technology Model 10 Sub, Rotel RP-855 turntable, Panasonic DMP-BD30, DIRECTV H21-700 DVR HD receiver, Free Agent Home Theatre+, Vizio 40" LED