The first time I heard the B&W Diamonds, the dealer was in the process of moving to a new location. So they did not do the B&W any favors.
The 2nd time I heard them, this same dealer must have jacked around with the NAD pre-pro or something - probably turned on Audyssey, which I hate. No wonder I thought the 802D sounded compressed - like EQ/Tones.
This time the sales guy was much more knowledgeable. He must have placed the Rotel in Direct mode. That's why the sound was crystal clear this time. I was able to hear all the details I was not able to easily hear before. It was like night and day. I could not figure it out why until now.
It wasn't the room. It was most likely some out-dated Audyssey EQ on an out-dated NAD.
No wonder the 802D sucked then, and sounded so good now.
Anyway, I've been listening all day long on the Phil3 to Beethoven's Piano Concertos by various artist including Anne-Sophie Mutter and Yo-Yo Ma. And I know what you mean about quality recordings.
Last time I took Mozart Piano Concerto No.21. It sucked. Well, the same recording sucked on the Phil3, Salon2, Orion, and KEF compared to the Beethoven concertos I heard today.
So I will only listen to high quality music. Period.
If the 802D sound at least as good as they did a few days ago, you won't have to worry about feeling disappointed. They sounded crystal clear a few days ago.