Alright here is an excerpt from Crutchfield.com about the Pioneer VSX-811s and the whole two speakers for back surrounds
"This receiver even has two back surround speaker terminals, so if you want to add a pair of speakers, you can share the sixth-channel power between the pair."
So this is definetly a 6.1 setup for hometheater, its not a 7.1 reciever its rated 6channels by 100watts. Its not an extra terminal from the B speakers its an extra back surround terminal. Has anyone heard a system with this setup.