Connection from router to streamer.

Coax rom the router? Not possible.

A computer network is a computer network no matter the application. For streaming the key thing is that the network is able to provide the music data stream fast enough to avoid dropouts or delays or prevent the streamer from switching to lower resolution to help it deliver data for analog conversion fast enough.

Otherwise the other aspect maybe worth consideration is if noise picked up on the network wire somehow leaks into the streamer’s music making circuitry where the analog music is made and causes jitter. Most good streamers should do a good job of isolating the music making circuit from the data network. So the key is a good quality streamer and modern jitter resistant DAC which is a fairly common thing these days. Do the homework when buying.  Sites that test streamers and DACs for things like jitter are great resources to help with buying decisions  

Trying to make a computer network itself “sound better” by reducing inherent noise at source is possible but not something I would worry about personally in most cases, but of course I know there are those who will. So do whatever seems to work but all that should be needed is a streamer that is truly good quality and designed to not let noise on the network leak into its music making circuitry and/or a modern jitter resistant DAC.

🤣

@mapman 

+1