Yup, Ian designed the M3's to use that 6.5" driver to it's full potential and just let it roll off the highs, an elegant design when you think about it. As JohnK pointed out the M22 does have a crossover, I have even swapped them out for some after market ones but I liked the OEM sound better.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70