I've ordered the Pioneer HTP-710 home-theater-in-a-box system, and I'm trying to figure out where to put the five satellite speakers. The speakers come with keyhole wall mounting brackets built in, but you can only rotate them to the left or right 35 degrees. I was planning on putting the rear L/R surrounds on the back wall in the upper corners, but unless I get separate wall mounts, I won't be able to angle them down. The same goes for the rear center surround speaker, which I was gonna place on the back wall at the same height as the other two rear surrounds. How much of a difference does angling the speakers down toward the listening area make? My only other option would be to mount the speakers closer together and lower on the back wall, directly behind the couch. The rear L/R surrounds would pretty much be aligned with the sides of the couch, with the rear center at the same height aligned with the center of the couch. WOuld having the surrounds closer together ruin the surround effect? Finally, I was planning on putting the front L/R speakers on the wall at the same height as the center speaker, but again, I can't angle them down. Would it work if I put the L/R speakers lower and angled the center speaker down? I can't order extra mounting brackets until I get the system, because I don't know how much the speakers weight. Any suggestions would be greatly appreciated. Thanks.