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...

TAM