What is the difference btwn dolby digital and dts?

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.

There is no difference...they're both basically hyped up "quad" 4 channel from the 70's....it's all smoke and mirrors really.

...lol

Brain Salad Surgery in quad!!!

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.

The new Perfect Vision has an article of the next generation Dolby Digital Plus and DTS-HD. Apparently major improvements.