“I still use the old coax from the router to the streamer”
I believe you’re referring to LAN (ethernet) cable not good ole COAX. For a source like Vault, head over to Amazon and purchase LINKUP - Cat8 Ethernet Patch Cable in 22AWG (yellow sleeve). Mind you, this cable is pretty stiff, if you prefer a flexible cable, try the 26AWG version (blue sleeve).
Connection from router to streamer.
We've all seen the discussion on analog vs digital, and cables. But what about the source TO the streamer. I have a Bluesound Vault - which I love, and I have it wired directly to my router so I don't have the added question of sound quality over wifi.
I have spent hundreds (if not thousands) on cables from the tt to the amp, better speaker cables, upgraded cable from the streamer to the amp, etc, but I still use the old coax from the router to the streamer. Isn't this kind of nullifying the other upgraded cables since the signal is already compromised from the initial source?