The B&W Nautilus 800 is very disappointing. That is why B&W does even want to talk about the Nautilus series. The B&W 800D is so superior over the Nautilus 800.
A few years ago I went down to a Hi-Fi Store , and they had the B&W Nautilus 800 set up. We had over $100K in electronics , cables hooked up to them and that is what I said "where the heck is the bass" ?? Very lean and bright and lacking slam in the midbass where is needed. My Sonus Faber Extrema speakers have more bass.
The B&W Nautilus 800 (800N) was not very natural sounding.
Live performances in both analog and digital were very thinned out and at times irritating.
For $16K price tage the B&W Nautilus is ridiculous. Even the candid dealer took me on the side and said B&W really &%#@! screwed up on this speaker. I earned the respect of this B&W dealer after he was very truthful with me.
I went down recently down to the same B&W dealer and now he has the 800D setup. WOW!!!! What a difference a letter can make.
In my personal opionion and many agree with me, the B&W 800 Nautilus was a short lived DOG. Even at the preowned price of $7K-8K range they are not a good choice.