AFAIK the challenge with making an HP version of the M3 is that the HP woofers roll off at a lower frequency than the regular woofers, making them a better fit for a 3-way than a 2-way.

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