drrmtaylor
These B&W 800’s have a nasty load right though the bass where all the grunt is needed from 60hz to 300hz, and need amps that have big current dumping balls
https://www.stereophile.com/images/511B800fig1.jpg
There are minima of 3.15 ohms at 91Hz, 3.1 ohms at 620Hz, and 3.67 ohms at 21kHz. Given that there are current-hungry combinations of 4 ohms and –52° electrical phase angle at 62Hz and 5.3 ohms and –39° phase angle at 8.6kHz, I believe this speaker should be rated as a 4 ohm loadThese are the amp you need out of your list, forget the others and the set tube mentioned
Classe 600
Rowland 735
Luxman 900
Cheers George