Scott79

Hi again, Thank you all for your answers. Forums like this are great. I live in Qatar, no one around here knows anything about NAD let alone the c390dd so this was the right place to ask this kinda question. Living in Qatar means the process of replacing this unit it petty much a BIG hassle, but I now sure it's the right thing to do... Hopefully after packing, dealing with DHL and waiting for a LOOONG time I'll get a new one... Don't tell the dealer but I might just have to hear one more song before I send it back... thanks again

Thanks again for your replies! Hmm.. do any of you with silent c390dd's go thru the trouble of grounding?

Thanks. Yes the noise is from the amp it self. And yes it dose bother me. Do you have one too? I take it's silent. Thanks to both of you for answering. It seems like this unit might have something wrong with it! I'll take your advice and send it back to the dealer!

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?