FWIW I have 801 S2 Mk IIIs. Currently in a medium sized, treated room. Formerly in a very large room. I have used various amps in biamped configuration- Krell, Crown and Mac.Since new I made sturdy pedestal bases filled with sand that must weigh about 35 lbs. That puts the tweeter at ear height when sitting.
Bass has never been an issue. Even though I have a subwoofer (VMPS) for extreme bass, I can switch it out on my pre amp and on most music I don’’t miss the sub- the 801’s are very adequate .
Right now run they with Mac 250/w amp (un biamped) and never sounded better.
As always, YMMV but the consensus opinion is that for these speakers, large current has always been recommended. Amps are easy to swap in and out- if you can borrow from a friend or dealer and experiment. Let us know