I'm thinking your NAD might be some of the problem. I know - I've read all the reviews about that 320 BEE. That's why I bought one for a small office system I started. I thought the 320BEE sounded harsh and congested. So, I traded it in, for not much more money, on a hybrid integrated amp. It has a tubed preamp section and a SS amplifier. I'm ashamed to admit it a Jolida 1501 (non remote model) 100 wpc. The sound is much better now. Just a thought.
good luck
good luck