Dumb-rod said:
Question is: Will a 7.1 reciever also decode in 6.1?
What kind of back center should I use? Same as a front center?
I had a Sony STR-DA995, which is also a "7" channel unit. Assuming they use the same basic operation on the higher ES line as the lower STR line, the manual has you connect only to the left rear surround to get 6.1. you can probably check the online manual to be sure. you might want to research the ES series, as a month or so ago, there were very few people saying good things about them
(though most people liked the STR series
).
all your back surround speakers should be the same, for the same reason your fronts and center should be from the same line, to match the timbre. (fronts and cetner could be, say Infinity Betas, while the back set could be Polk Audio RTi series) just so long as each within a given set match up)