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I will go for the amp per frequency band though because [they] don’t match
Yes, obvs. I was assuming two identical stereo power amps (or better still 4 identical mono amps 🙂)
FWIW, all the sample Bi-amp wiring diagrams on teh internetz seem to show a band per amp box rather than the channel per amp box that I've been using for decades, so you at least have the majority on your side even without the mismatched amps.
Yeah, the levels are controlled in the DSP software so I can just leave the amps alone when they’re set. I will go for the amp per frequency band though because then I can connect up my 2 power amps (using the Toppings just as dacs) which don’t match, to see what that does. SS to the woofers and valves to the horns.