I am setting up a 6 channel sound system in a 80'(screen-back) x 33' Wide x 20' high room. Speakers will be flown from the ceiling. What is the best position for my surround speakers? All the manuals I've read suggest side placement facing inward, does that carry over into a room of this size, or should I be trying some other positions? Are there any books/websites that would help me?