I have a CHT-15 on the way, and don't know the first thing about how to set it up! I'm replacing an 8" BIC sub:b to complete my setup. I have 4 JBL S-36, S-Center, Tosh 65HX81, in a room approx. 12' x 15' x 7.5'. I probably only have two options for sub placement- either the front left corner of the room, about 3 feet from the front wall, or the back left corner behind the sofa, which sits about 2 1/2' from the back wall. I need some advice on placement, calibration, etc., or someplace to look for information intended for someone who doesn't understand the technical jargon, i.e. nulls, room gain, etc. I do have a rat shack SPL meter. Any help for a novice would be appreciated.