Might be just as well off running in 4.x sans a center channel. From with I hear the 8C's are distinctive enough in FR that matching anything close will be every difficult.
I have and that is what has driven me to insist on having three identical speakers for L/C/R.
Thanks. Agreed, identical speakers are the best answer but this isn't an option for me right now. I was hoping, then, that perhaps speakers with similar characteristics (i.e., flat amplitude and phase response) would be suitable but don't know of suitable candidates. Is it correct, though, that matching is less critical for the surround speakers (for movies)?