asap,
"so why does Axiom suggest the vp50?"
I think that the M2 and VP50 are matched by Axiom because their price & performance are at the same level. The M3 and VP100 are steps up both in performance and price, and you would benefit if you were able to upgrade either speaker. Not to say the M2/VP50 would disappoint, but the M3/VP100 would most likely sound better for you. Again, if you can only upgrade one of the two speakers, you could still expect a performance improvement. Good luck.

lando

lando