I've only seen this movie once so far, but the time I saw it, the audio seemed far lower than normal. Wonder if that has anything to do with it.
I actually missed the IMAX version of this since the TMNT crap took over before I could go to see it, but from the IMAX preview I went to for this over a month ago, it seemed like a way more enjoyable experience. Does IMAX actually have people calibrating their systems on a daily basis, as they claim on their site?