>3khz - T25bThat is really close, arguably the Purify 6.5" midrange is a bit better. Distortion wise the dome is a bit better though, but only > 1kHz. When crossing to a tweeter, that should not be an issue at all.
1-3khz - M74b
400-1khz - Purifi 6.5" midrange
<400 - Purifi 8" midwoofer
4 way, much harder, super expensive but very interesting indeed. Cross to subs and endgame achieved.