HT newbie here.. I just recently purchased my first 5.1 surround sound setup (Yamaha HTR-6240 receiver w/ Polk RM6750 surround sound speakers/subwoofer) for our condo. I'm mounting the surround sound speakers using brackets on a rear wall approx. a foot behind our couch (the central listening area) and am following the recommended placement instructions (two feet above ear level at the listening position, 90-110 degrees from center). Since the brackets swivel left/right/up/down, is there a suggested direction to point the surround speakers ? Should they just remain parallel to the wall on which they are mounted and not be angled downward ? Should they be angled slightly down so they point at the central listening position ? []--T V--[] ooo []----------[] Thanks..