Nothing wrong with the M2's running with their natural roll off in combination with the 400, the M2s have a fairly steep roll off. I would set the 400 crossover on the amp at either the 100 or 80 hz setting going with which ever sounds best.


Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70