I think this was discussed when either M100 or M5HP came out, and the response was that the HP driver could not reach up high enough to cross over with the tweeter in a two-way system.

Still enjoying my M40's. I have heard relatively few speakers in anything like their price range with such a smooth, extended low end response.

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