Remember that 60s will require *less* power to drive than smaller speakers, not more. The only catch with big speakers is that we tend to put them in big rooms and ask them to play really loudly, that's when the extra power comes in.

I think we're assuming that you're looking for something less than ear-bleeding volumes, is that a safe assumption ?

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8