I don't think the bass hump in the M3s is as pronounced as, say, the Rogers LS3/5A "BBC monitors". I don't have a graph in front of me but from what I remember they peaked the bass up a bit as well...

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