<font color='#000000'>I have recently purchased my TX-SR800 and I am quite happy with the return on investment. I am in the process of adding a back speaker for 6.1 surround. As I have only one speaker but right and left back speaker posts on the receiver, I am curious as to which post to attach to. My manual does not address this issue as all diagrams and documentation refer to two back speakers. Purchasing a 7th speaker is not an option. Does anybody has any experience with this situation? I am surprised that Onkyo does not address this as it seems like this would be a common circumstance.</font>