My new onkyo receiver (SR800) has connections for two 'center back' left and right channels (7.1). I'm already set on buying the QS8's for the left and right surrounds--would I want to match them with a pair of QS8's for the center back channels as well? Essentially, I'm wanting to know if 4 QS8's would be overkill for a medium sized room (10 x 15 ft). Moreover, would I want two diffusing speakers for the 'center backs' in the first place? Would direct speakers be more appropriate here?

I intend to have 2 M3ti's for the mains and a VP100 center...Any comments would be appreciated. (Admittedly an HT newbie)

Thankyou.