I'm not sure if Axiom intends the FMBs to be used with M22s in a main configuration or just as surrounds. Don't think there is as much bass content in the surround channels so maybe the port/wall effects don't matter so much ?

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