I recently purchased my first real surround system which consists of Monitor 70II speakers for the FL/FR/RL/RR channels and a matching CS2II center channel. I didn't realize how much more emphasis the center channel had compared to the others (my past experience with "surround sound" systems was basically multi-channel stereo, so all of the speakers were equally important). Also, I now know I didn't need to get 70 series speakers for the rear channels since they don't provide as much of the surround sound, but I do like the fact that all of the F/R channels match and that the 70s have larger drivers.
This brings me to my question. If I were to upgrade my center channel to a CSiA4 or even better a CSiA6, would it sound balanced? Or would the CSi center overpower the other channels? I don't know how much of an upgrade the CSi series is over the Monitor series in actual sound. My receiver does have Audyssey, so it would of course try to provide the best sound overall.
Second, my CS2 has 6.5" drivers. The CSiA4 has 5.25" drivers. Would the CSiA4 still sound better than the CS2 even though the CS2 has larger drivers? Or should I not consider the CSiA4 because it wouldn't be as much of an upgrade and just go for the CSiA6?
I appreciate everyone's insight!