Many thanks for the advice. Although the question was naive, it seems the veterans on this forum are very generous and eager to help.
I will certainly get a C10. But, if anyone asks, I will claim that (after extensive research) I selected a C10 for the center and then added some
F10's later for right and left. I was quite surprised to learn that a third F10 (assuming there was room without redesigning everything) would
work well as a center speaker. It is easy to get the impression that "center speakers" are specially designed for that function.
I hate to ask, but will I get banned from this forum if I continue to use my old Sony speakers for surrounds without springing for the Synergy
Surrounds (currently $159.99 a pair on Newegg)?