>>As for Axiom (and if my memory serves me right), their burn-in period is 100 hours at at least 400W (M80s).

That's their "power handling test" performed on a single speaker from time to time, not break-in performed on every speaker. Each speaker does get hooked up to a signal generator and checked for frequency response (and distortion ?) but that is not considered to be "break in".

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