Ive been reading a lot about certian DVD's and CD's you can order to help calibrate your picture and home theater sound. Where can I get one of these? Where can I learn about how to do it? I have no idea where to position my speakers within the room. The HT is in a ~ 12 x 12 area, with an open end on one side leading to the rest of the house. TV is 27" in a ~ 4'6" wide, 2' deep entertainment center which site in the middle of 1 wall. The couch sits across from it. It is ~ 7' long and 3'6" deep. I am planning on getting some speaker stands to put next to the entertainment center for the left and the right, with the subwoofer on the floor next to one of them. I was also planning on getting 2 more stands that could fit to the sides of the couch on either side, but it would be difficult to line them up with the front speakers. Here is a very crude drawing. Where can I read up on how to get this set up correctly?