Gonk raised a good point here. What's up with this disc? Well, here's a quote from the dvdfile.com review of the audio portion of this release:

Quote:
The original release sported a fine Dolby Digital 5.1 track, but this new disc adds a DTS track. Each mix-down was derived from the multi-channel IMAX theatrical tracks and it's very well done. The surrounds are used very aggressively, from chickens clucking off-camera as Mr. Lyons investigates an old heap of a car, long stored in a chicken coup, to off-camera mechanics working on their cars as our attention is focused on an onscreen principal. As you would expect, there are many audible pans of cars on the track and, as Mario Andretti is reunited at the end of the film with his first track roadster, on the road. EX decoding is splendid, despite the fact that this is not an official EX mix. The viewer is enveloped in sound. Cars passing under a locked down camera, pan perfectly from front to back or back to front while other sounds maintain perfect side imaging. Don't expect deep bass from the engines. Designed to operate optimally at well over ten thousand RPM, these machines scream. But you will experience deep bass as you drive under large structures, such as pedestrian bridges erected over the tracks. I did notice a slight harshness to the sound, most evident in the dialog. Dryly recorded narration usually has the highest fidelity; here, there is a subtle raspiness that interferes with the reproduction. Gilles Ouellet's contemporary score pounds, intended to raise the viewers' excitement during the track scenes, but it was hard to judge its fidelity in the presence of so much exhaust noise. And take note that both tracks seem to be unusually loud. You might want to crank down the gain by four to six dB before you get started, then adjust to a comfortable level.

I carefully compared the DTS and Dolby Digital tracks and in terms of timbre, neither wins. This may be due to the slight raspiness I detected in voices that indicates the presence of low-level distortion products that reduced compression simply won't help. But I did find that the DTS mix was more enveloping, with a better-structured surround field. And the bass did have more of a bite than the Dolby Digital track. I suspect that I was comparing apples and oranges. The DTS track was newly created for this disc.


If this problem is directly related to this disc, well, this may be an answer. These DTS soundtracks may just be overpowering your speakers.