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Happy Holidays!
I was just kidding about Mapleshade -- mostly because of the recent posting that attracted a lot of attention.

Since the system is ok at the current volumes I don't need to do anything. I might look into some AC filters but they are a lot of money and I am not sure that is an issue -- again since I can't hear hum at normal volumes. What is puzzling me is that it gets a little worse when the AVR is connected.
Enjoy the holidays!