i have the B&W n803 in my secondary system. it is a different speaker than the 803D, but the required power to get all the drivers fully engaged, according to B&W, is similar and substantial. the pass 350 should have no problem with this, but i would think not the best choice for the tweeters of the 803D. the xpoint5 series would be better.
re: roxy54's comment regarding the x250.5 - on audiogon you mentioned that you were displeased with the sound of this amp, but after you had sold it, you found out that the bias was out of wack. so, upon its return, did you re-audition it fully, or are your comments based on an amp that was not working properly ?! i have never heard anyone associate the xpoint 5 series with "grainy and electronic sounding" unless it is being compared with another amp that well above the x250.5 price range. pls clarify. thanks.