Something interesting is going on here as I have discovered using DVE.. I decided to give it another try after watching a movie I had rented. My subwoofer is playing now at THX setting 70dB and last week it was playing at 67dB for limited bandwidth pink noise on DVE.
I set all the levels in the XA2 to -3dB except for the subwoofer which is still at 0. They are all set to large still. Now each channel plays at 70dB at limited bandwidth pink noise. Very strange. So I put in Tranformers and does anything go wrong you may ask? Nope. It plays fine.
I think we can rule out it is not a disc related problem also.