Ken, the info posted at one point on the Axiom site has since changed.
I believe that the M3/M40/M50 uses the 1" tweeter but also have different crossover points.
Here are some posts that might clear some of this up (or not):
post one
post two
post three

Perhaps Alan, Amie or Ian can set the record straight about all these specs. Several ppl on the forums have asked for the crossover points on the Axiom models in their entirety just out of curiousity.

"Those who preach the myths of audio are ignorant of truth."