Do you think the M50s have a bass hump ? My understanding was that they were pretty flat at the low end, ie more like an M60 than an M3.

IIRC there is a response chart on the Axiom web site but I'm having trouble getting into the site right now.

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