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If I use good quality equipment, like a good dac, a good amp and speakers (with good measurements) and a good acoustic treatment, do I really need a power conditioner or power regenerator? will I get sonic benefits? Don't good devices already have great filtering for noise or pollution that degrades the sound? Basically I don't know if I plug everything straight into the socket or use some ''filter''. I think this question is valid and I think that many have it too, since spending money testing each product is not at all viable for me. I've been researching recently about power conditioner, power filter and etc, I always think about not very expensive solutions to improve the quality of my setup or at least have stable power without much noise. When reading in other forums and reading reviews, it seems encouraging, but it is very relative and depends on the setup of each one. I see that the question is not as simple as saying whether ''need'' (or not) from the moment you identify ''a problem'' as noise, hum or audible ground loop in the sound, often the noise may not be very noticeable and we think everything is ok (with degraded sound quality), until we test a product like that. Everything gets more confusing when we see that it's not enough just to buy a suitable power conditioner and ok, certain products alter the sound and can compress soundstage, bass or harm the treble, because the power is cut a little, the solution for this they say it's the ones' 'power regenerators'', but which are too expensive.

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?