Ok, I did a search here about wiring two speakers together for the back channel in a 6.1 setup, and it reaffirmed my idea of wiring two speakers together in series. It's recommended, i think thx and dolby recommend two for the back instead of one, i forgot where i read that, so i thought i'd give it a try. Anway, my question is, is it worth wiring up two speakers back there? I understand how to wire them up in series, but would that added resistance be a problem for the amp? (I don't want to wire them in parallel and put THAT load on the amp, right?) And question the second is: I see more expensive recievers out there that say 7.1 on them, with either 7 power amps or "7.1 decoding" so you can run two rear speakers(through their amps, or to 2 external amps). Is it just sending mono signal to those rear speakers or is it doing some kind of processing to get two separate channels out of that? Thanks.