It is very confusing to decide which speaker to use as a centre rear. First, many recommend using 2 speakers in parallel connected obviously to just one channel output (?). However, all of the salespeople in shops said I should use only ONE as the centre rear. So whats better? Second, I am thinking of buying Mission 773e, M7C1 front centre, M7DS rear speakers, Denon AVR 2802 receiver. My choice for centre rear would be either another M7DS or an M7C1. The salespeople said I should use a centre speaker for the centre rear channel, NOT a bipolar effects speaker. Thats because they reckon you need a directional sound from it What are your opinions?