I've owned several NAD components through the years, and thus am very doubtful that the hum you are experiencing is normal. If the hum were eliminated, would you still feel the need to change amps?
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I've not heard either, but my understanding is that Nelson Pass designed the circuit for the Panache, if that is true, it is hard to believe that one of the industry's greatest designers did not produce an integrated to beat the NAD. Not that NAD is bad, I certainly don't mean to imply that, but there is magic to anything Nelson Pass puts his hands on.
I had the Portal Panache for quite a while, and loved every single minute. I don't think I've ever heard such great midrange, silky and smooth. It made my Sonus Fabers soar. But, I had problems with an audible buzz that would come through the speakers. I went through 2 different amps, tested in multiple rooms with various power conditioning. Also had dedicated circuits. I could not get it to stop. I took it to the manufacturer, and of course, it was dead silent!
Just something with my neighborhood I suppose.