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Dear All, Believe it or not this is my first forum entry ever! Reason for joining and making this thread is that I need to convince myself that my newly purchased c390dd is "normal". I got it two weeks ago. Spent I week or so setting up, getting proper cables etc, and have now been using for a week. First off this is an amazing amp. I use it to drive my PM1's and the whole setup sounds great; don't regret a minute... AWESOME! However I have one doubt, and this is where I need your help: When attached to the mains both on, off and when playing, the unit produces a very slight high pith hum. This is only audible when very close and everything around me quiet.... I have tried to contact the dealer and NAD and none of them really know. Note: I have tried with and without speaker/woofer cables attached and running the mains thru linsy 6way mains conditioner.. I have yet to try to ground the unit as recommended in the manual... Everything seems alright and sounds GREAT.. But I need to know; has anybody experienced this; IS THIS NORMAL?