Most, but not all, here seem to prefer the more diffuse/enveloping sound of the QS series for surround speakers - rather than an easily localizable source like the M22. I'm sure there is somebody here that can explain it better than that, but the speaker companies that seem to really study and understand sound (Axiom, Polk, I'm sure there are others) seem to have similar designs for their speakers that they make solely for surround use.