They're pretty different. The NAD is laid back and I could listen to it for hours with no fatigue. The P7 is more exciting and has more sparkle on the high end, it's not bright overall but on some recordings the treble can be a bit harsh. I've heard people say that the P7 is never harsh or sibilant but I'd encourage If I had to choose only one it would be the P7, but they're different enough that I'll probably keep both.
11/26/13 at 12:56pm