Dolby Digital and the DTS Coherent Acoustics (DCA) codecs are both audio compression technologies that package and deliver audio digitally. They’re audio codecs that code and decode signals to transmit them, but what makes them different than the codecs we usually talk about when discussing Bluetooth is that DTS and Dolby Digital are specifically for surround sound. This means they compress data meant for surround sound systems (up to 7.1). The way that this is achieved differs between Dolby Digital and DTS and has to do with their respective audio encoding processes as well as the bitrate, but the debate about which one sounds better is best left to the forums. The only thing that you need to know is that both of these codecs provide great audio experiences with a surround sound setup.