Mixing/matching speakers w/home theater set up?

Question

This is my situation - I have 4 Klipsch Synergy SLX wall mountable speakers. I plan on using them for the front r/l and center with the 4th a possible rear center if I go 6.1 instead of 5.1 (otherwise I will use the 4th for my center downstairs). How important is it that my sub wolfer and rear l/r speakers are also Klipsch? Also, my 'media' room will be 15x18 - would I be improving sound very much w/6.1 opposed to 5.1 (all 3 rear speakers would have to be on the wall behind the sofa)

Answer 1

You can get away with rear speakers being different makes/models than the front, but it is not ideal.

Even if they are all Klipsch, you want the same model because different speakers from the same company sound different.

The subwoofer can be any brand. These don't 'tone-match' to the other speakers.