You'll find quick, equipment-focused answers: Toslink on consumer kit is reliable roughly 5–10 meters for older or low-quality cables. Some cables reach ~30 m but risk dropouts. Treat ADAT/Lightpipe conservatively unless your gear specifies longer spans. Use multimode fiber for short-to-medium runs. The length of an optical audio cable can be influenced by several factors. Understanding these factors is crucial to ensure optimal performance and avoid signal loss or degradation. Higher-quality. The maximum distance before signal degradation occurs typically falls between 10 to 30 meters, depending on the cable quality and the specific application. This range is a critical consideration for audiophiles and professionals setting up home theaters or recording studios. I'd just get a 100ft toslink cable? Any inline couplers would degrade the quality of the signal and you'd need to have some sort of amplifier at a midpoint.