Charles, the big improvement from active M2 would be a 3dB boost to sensitivity. Linearity can be improved but the audible benefits would be minor.

Not sure it would be worth the 3 grand they might cost (DSP and amp included).

Active M5 OW may be a good thing though. The OW are very under-rated. Now that I have M2OW for 2-channel, I can hear how good they are and it is so cool to have great-sounding speakers that are out of the way. I'd have never believed it if I had not tried it.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated