So your speakers are bi-amp able? If they are, that is your answer. Add a pair of class Ds to run the bass and you won't be running out of gas an time soon.
As far as C22 sure looks like a Mac with XLR.. Kinda cool. Same circuit as the C2500, just no DAC..
Mac and Mac they just go together. As far as speakers, work with what you got!! I've set up a few B&Ws. Around here they are know as torpedoes. I had a few pairs. 800 D3s for over a month. Nice speaker. I used 601 mono blocks and a C2600. The guy was stuck on several drill platform setups with new equipment.
That mean at least a year living out of a stupid helicopter. Noisy pieces of crap.
I miss that, just about like kidney stones.
Regards