Marmitek Split TS14 - Optical splitter - 1 in / 4 out - Toslink, Black, 1x Toslink, 4x Toslink, Female, Female, 46 mm
Your TV has 1 Toslink output, but you use 4 amplifiers. This requires the Toslink cable to be split from 1 into 4. An additional amplifier could be, for example, a surround set, a sound bar of an amplifier in the kitchen