I got a Denon AVR 3806 recently and I have a 7.1 speaker setup. But I am unable to get the 7.1 output working from the receiver. The Denon has 10 speaker outputs FL, C, FR, SL-A, SR-A, SL-B, SR-B, SBL, SBR and Sub. This is what I did. I connected my speakers to the respective outputs and left the SL-B and SR-B empty. In the speaker config, I chose Surround B speakers to none and chose 2 speakers for Surround back speakers. But after doing this, when I go to the speaker test menu, I get no output from the surround back left and right speakers. In the power amp assign menu for surround back speakers, I have it assigned as surround back. Is there something else that I am missing? Is there some other setting that I have to do? I have read through the manual back and forth and I don't seem to get it to work. Please help. PS: Please note that the wiring for surround back is correct and I get a 5.1 output (in those speakers) when I connect to surround back speakers as surrournd B speakers and setting the mode to A+B.