Introduction: What is DTS 5.1? DTS (Digital Theater Systems) 5.1 is a surround sound audio format commonly found in DVDs, Blu-rays, and high-definition movie downloads (like MKV files). While DTS offers superior audio quality, it is not universally supported. Many smart TVs, mobile devices, and media players (like some older Roku or Apple TV models) cannot decode DTS audio natively. Www89com Six X Video Top