Krell 450 MCX or 700MCX

Which sounds better with the B&W 800 Nautilus Signature, the 450MCX, or the 700MCX? Anyone knows or with experience. Thank you
A very good question!
I would call Krell and see if they have an opinion.

If I couldn't get a definitive answer, I would go for the mono's for two reasons:
1. In my conversations with Dan D'Agostino, he really seems to lean toward his mono amps.
2. The mono's will be much lighter and easier to properly position (which may also save money on speaker cables), move (should you), and ship.

I hope you get more answers.

Oviously the mono are better if you have no need of the last 2 db of spl capability. Just my 0.02