The Dolby Digital 5.1 channel soundtrack is one of the best tracks that I have ever encountered. There are plenty of showy moments during the battle scenes, in which the track comes to explosive life, but this isn't what impressed me about the DVD's audio. What I found aurally pleasing, were the subtleties of the sound mix, as well as the spaciousness of the entire 360-degree soundstage. There is an open, effortless quality about the soundtrack that is difficult to describe, other than to say that the film's quiet moments are enveloping, engaging and convincingly real. In the combat, mode the mix is fully directional with aggressive deployment of the split surround channels.
Dialogue is reproduced with a natural timbre and every utterance remains fully intelligible.
The bass channel is full and powerful, which gives in you face realism to weapon's fire and explosions. Hans Zimmer's has composed a wonderfully stirring score that is mixed into the soundtrack to maintain its full musical integrity. As good as the Dolby Digital track is, the 5.1 channel DTS soundtrack adds another dimension of warmth and richness to the film's sound effects, to the bass channel, and especially to Hans Zimmer's music. While DTS does have a sonic edge here, viewers shouldn't feel shortchanged if their system only offers Dolby Digital compatibility. An English Dolby Surround soundtrack is also encoded onto the DVD, as English and Spanish subtitles.