pirke

For home theater, most sound is coming from the center speaker. Then there are the surround speakers. Why do people choose smaller speakers for the rear speakers (in a 5.1 setup)? Aren't they just as important as the front speakers? Currently, I'm putting together a HT 5.1 setup. Note that I'm seating directly at the rear wall, and I can't put speakers on the side wall. My room is 13' long and 20' wide. I think I'll go for the RF82 as front speakers, and my dealer suggests RS42 as rear ones. But this comes to me as a suprise. Sure, I can get sound from side/above, but they seem very limited compared to the RF82. And if those RS42 are "good enough" as rear speakers, why do I need the big RF82? I won't be listening to music (perhaps 5% of the time, compared to 95% movie). Maybe I should reduce the size of the fronts and use equal surround ones? Like 4 RF62 speakers? Can anybody advice me in this matter? BTW, I've got a Marantz SR7002 receiver, so power won't be a problem.