I suspect the NAD amp is part of the problem, but I don't know that particular NAD. A tube amp would probably help to tame one of the biggest problems of the N805's, those "sizzling" tweeters, but then the 805's also like a fair amount of power.
What's your budget? "selling all that crap and starting over" might be the best, if you can afford it. And if you want to use tubes, pick tube-friendly speakers. BTW, I bought used N805's once, & didn't even like them enough to use in an office system.
What's your budget? "selling all that crap and starting over" might be the best, if you can afford it. And if you want to use tubes, pick tube-friendly speakers. BTW, I bought used N805's once, & didn't even like them enough to use in an office system.