I tried playing w/ the positioning quite a bit when I first set everything up. Due to space constraints, it is setup about as close as I could get every speaker so its equidistant from the listening spot.
To calibrate the speakers to 75dB, I used the Video Essentials DVD. I had to turn the volume to -25dB to get a good baseline, and did the fine tuning from there.
Once again, due to space, I am unable to move the rack from its current spot. The price I have to pay for being an apt. dweller I guess. I was already planning on switching out the center and one of the fronts to see what kind of results I would get. I will probably wait until wed. when I can have my SPL meter in front of me again though.
