Theatrical DTS uses the APT-X ADPCM compression system. It's a 16-bit five-channel system with a sampling rate of 44.1kHz and a bit-rate of 882kbps. The LFE material isn't recorded as a discrete channel as it is in the domestic system, rather placed in the surround channels and extracted at the playback stage.
Domestic DTS uses DTS's proprietary Coherent Acoustics perceptual coding compression scheme. Current operating rates are 754kbps and 1509kbps on DVD at a sampling rate of 48kHz, and 1235kbps/44.1kHz on LaserDisc and CD. Sampling rates of 192kHz and 24-bit resolution are theoretically possible using this system, albeit not on DVD-Video.

Dolby Digital uses the conventional 5.1-channel configuration in theatres and operates at 320kbps/48kHz. Domestically, Dolby Digital operates at 32kbps-640kbps, although DVD's maximum bit-rate is restricted to 448kbps. Like DTS's domestic system, it nominally operates at 20-bit resolution and a sampling rate of 48kHz on DVD but (like DTS's domestic system) is also compatible with 24-bit source material.

Sony have the option to include SDDS on DVD-Video at their discretion, but have stated they have no plans to do so.

THX EX is not a 7.1 system; it isn't even a recording format, rather a playback/hardware application like Dolby Pro Logic. It extracts the matrixed centre-surround channel from Dolby Digital Surround EX-encoded 5.1 soundtracks. As a hardware application, there are no DVDs/software available in THX-EX, just as there are no DVDs available in Pro Logic (rather Dolby Digital Surround EX and Dolby Surround, respectively).