My Anthem AVM20 automatically starts the pink noise at 85db. which is reference level. Once I get my speakers set with the SPL, I never have to change them. It does not have to be changed for each movie. Twopecker, there is something wrong with your set up if you are having that much trouble hearing the center. I watched LOTR Two Towers and thought it was excellent. My wife even commented on the sound. I have Axiom all around. Keep us posted.
gthomas