Before I recently upgraded to QS8V4s, I used QS4V3s with a pair of M22s as L & R. Except for an extra 5.25 incher, the M22s have the same drivers as the M2s.
Timbre match seemed fine to me; however, the sporadic, rapid-fire content from the surround mix in most movies really makes it hard to ascertain timbre matching, at least for me.
IMO, timbre matching is most important for the front 3 channels - surround not so much...
Absolutely - I care a lot about the fronts matching. Not so sure about rears.
I was watching some "demo" content on some blu-rays today in someone else's theater. I noticed that there wasn't much that really panned between the speakers.
There was a scene in "The Forbidden Kingdom" with Jackie Chan/Jet Li - the duel with the monkey king at the beginning - where there was some panning. In my friend's theater the rears are a different brand. I have to admit I couldn't really tell any problems. He bought a 5.1 package sometime back, then added some speakers he had lying around for rears.
I guess when you're going to lay down the money, you want to cover all your bases!
Sounds like the QS4 and M2s will work just fine for me. No one begs to differ, right?