I know this sounds dumb but I'm new at this and am comfused by the manual for my new Pioneer VSX-816. I have a 5.1 speakers system, two surround speakers are mounted above and behind the listening zone. I thought that these would be "surround back" speakers (as shown in the drawings in the manual) but I don't hear sound from these speakers in this mode. Should I connect them as "surround" speakers? In the manual, these are pictured on the sides of the listening position, not behind. What would be a good TV show to watch (with digital cable) to test the surround speakers?

Thanks!