Carlings, you've found the Nad lacks with detail? Have you ever experimented with replacing the preamp jumpers? When I did this on my C326BEE, added highs gave more resolution. I've also owned the C372 and found it laid back, but I never replaced the jumpers on that one. But the detail available with the 326 is actually pretty good for a budget integrated amp, though I've got upgraded speaker and RCA cables as well.
If you have some extra good quality rca cables, it might be worth a try.
If you have some extra good quality rca cables, it might be worth a try.