Gents, I really appreciate the info.
TDK.....thanks for checking again and I hope that I haven't made you aware of something that will bug you like the tiny squeak in a car. I know that the sound somewhat decreases when I switch to the pure direct mode.
You mean like the high-pitched ring a tube TV gives off, almost in dog whistle range?
SROBAK, Yes, the sound is as you described and only emanates from the unit itself and there are no sounds coming from the speakers. None of the speaker hiss I have read about here. The closer I put my ear to the top of the unit, the better i can hear it. It is not something that I couldn't live with, I just want to make sure I didn't get a lemon.
As far as grounding the unit, well I might have to. For now i have only plugged it in, hooked up my RF3's and the DVD/CD player. The unit is more complex than my old Sony so I have some reading to do about grounding.
Thanks for the responses again,
Mark