re: tweeter vs woofer -- the difference between M3/40/50 and 2/22/60/80 is mostly in the 4-5 KHz range, which "officially" is tweeter territory but in reality is in the crossover region where both drivers are contributing. Axiom folks have posted a couple of times that the difference is primarily caused by lower off-axis output from the woofer at the top end of its frequency range, ie the 6.5" naturally rolls off more sharply and/or at a lower frequency than the 5.5" woofer.

A resistor does not seem like an ideal solution for what is really a response bump (or, more precisely, lack of a response dip). I'm rusty on crossover design but at first glance a series capacitor might be a better "hack" than a series resistor, although of course there would be additional phase changes in the crossover region and the effects of those are always hard to predict.

Has anyone with M2/M22/M60/M80 speakers had access to a good parametric EQ and taken down the 4-5 KHz range a couple of dB to see if that has the same effect as switching to M3/M40/M50 ?

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