Drubin - I wish I had been to your IMAX! I thought the visuals were great at the IMAX in Westminster, CO, but the LFE channel was turned up so loud I could not hear the dialog. There are several posts on the web about it, so it wasn't just my aging, rock-abused ears. Even my wife, who has radar-ears said the same thing. Also the movie could have used tighter editing, it was at least 15 minutes too long. Just my $0.02, YMMV.
Do you enjoy the sound at your local Theater Plex?
Can you tell what kind of audio system is used? Is it "audiophile" sound quality?