Driving them with an H/K 630. It's possible I'm running out of power but I have never heard anything that sounds like clipping yet.

Guess I should haul my butt down the stairs and swap left/right channels and see what happens...

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