DOS2 Stereo Setup

[Snoopy8]

I would love to use UPNP and have tried multiple times, but cant find a suitable replacement for my library software, that also does UPNP and does it all really well.

I have been using MinimServer running on an Intel NUC and BubbleUPnP app on Android for a number of years.

Really considering dante like soltuion is probably what i am looking for.

I would go with the Dante -> Ethernet to Optical solution, this is my leading theoretical option.

If your source is a PC, there is a Dante virtual sound card that you can use and your will need an adapter for each Phantom.  There are some  products which can convert digital to Dante e.g JBL ADP-55, Trinnov MC Pro.  But Dante is is more for Pro Audio products.  All of them are expensive.

This thread is worth reading
https://devialetchat.com/Thread-Custom-R...-and-Dante

You could convert an analog signa to Dante, but that is a compromise.