[hddummy]

We'll need a little more info on what kind of equipment you have, how you have them connected and what settings you are using.

DTS is a particular type of sound format...it's like having a secondary sound file on the disk. There really aren't that many DVDs that have a DTS option. IF they do, you have to go in the setup section on the DVD and select DTS as the output.

 

[hddummy]

What sort of cable are you using for audio? You need to use an S/PDIF Digital cable (optical or coax) or HDMI in order to transmit Dolby Digital and DTS. If you are using a pair of RCA cables, then the best you could possibly get would be Dolby ProLogic, ProLogic II or ProLogic IIx depending on the capability of your receiver and DVD player.

 

[hddummy]

can we get the model numbers for your equipment

 

[hddummy]

http://www.1800customersupport.com/productdocuments/RT2870_RCA.pdf

Looks like you've got everything you need to enjoy dolby digital. Again, no mention of DTS in the manual, so stick with DD and you're good.