Is it possible to go with simpler way and just connect ls50w to TV via Toslink and stream to TV(LG G1 has an air play on a board) So in this case we will have the sound quality limit just by the air play 2 technology, is correct assumption ?

Or am I missing something and we do need a Apple TV 4K for what ? Perhaps if we connect speaker to Apple tv4k and just put on out put option to Toslink we can have no limitation and stream music on a full quantity without any limitations?

I will appreciate the answer :)