In response to Redwoodgarden, the only speakers I don't have are rear and the possible side ones. Decoder is a Lexicon DC1, main speakers Mirage M3si. Rear and side amps are Adcom GFA 535. Seating position is 16 feet from front wall, so about 12-13 feet from screen.
7 or 5 speakers
HT room dimensions are 14 by 22. I am seated about 16 feet from the screen. Should I use a 7 speaker setup with side speakewrs or is the 5 speaker setup good enough. What information is processed by the side speakers that I might miss? Also.... 12 inch Velodyne sub enough to pressurize the romm (I don't listen to rap, dance or any crap and it would ONLY be used in movie applications, not 2 channel).