Listening to the 5.1 DD track, the center channel dialogue seemed low and distorted (yes, my speakers have been calibrated with AVIA) compared to the other channels. This was mainly near the beginning of the film. I had to turn it WAY up to understand what they were saying and then then FX blew me away! The situation got much better as the film progressed. Maybe it's just the mix? I'll try to compare the DTS version tomorrow. I'll also check my center speaker to make sure its working 100% and is still calibrated with the other speakers.