Yes, DTS is less compression. However, I seem to vaguely recall thinking some DD movies sounded better than their DTS counterparts, not really sure why that would be though.
Dolby Digital is a 20:1 compression versus 4:1 for DTS, so DTS soundtracks can be full range for each channel if done right, verus Dolby Digital which isn't full range on every channel. But this still depends on whether the DTS soundtrack was mixed correctly.
You really need full range speakers to take advantage of DTS however since you are feeding it full range information.
I believe Cytocycle describes it best. DTS is designed for full range at four corners and DD is designed for rears to be small. di or bi-pole. My experience is DTS sets a better central focus of sound.
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