It would use the "side surrounds". The back surrounds would be unique to a 7.1 setup. Of course, if your receiver has Dolby Pro Logic IIx, it may matrix the 5.1 signal to 7.1.
Originally Posted by tommyv2 /forum/post/12911890
When you have a proper 7.1 channel set up, what happens when you play 5.1 or 6.1 content? What speakers does the amp use for "surround'? Back ones or side ones? Just curious, because I'm planning on doing an entire 7.1 setup, although most of the time it will be used for 5.1 content. Not sure if it matters but it will be a Denon AVR-2308 over HDMI.