The DTS CDs are 16bit/44.1kHz 5.1 surround sound, and lossy (but a lot less lossy than Dolby Digital). DVD-Audio can be up to 24bit/96kHz 5.1 surround sound, and lossless. The increase in bit depth (24 vs. 16) makes the biggest difference in sound quality when comparing two similar studio recordings. You must have a DVD-Audio capable player to be able to play the lossless 24 bit stereo or lossless 24 bit surround sound track. You can still play the DTS or Dolby Digital track from a DVD-Audio disc even if you only have a DVD-video player. These lossy tracks can support up to 24 bit, but might only actually be about 18 bit, as with DVD-video discs.