Make sure you use a high quality ethernet cable as it does make a difference. Also, connect your ethernet cable to an LAN iSilencer and you will be amazed.
Ethernet connection for best sound quality
As far as I'm aware of for streaming audio with tidal hi fi plus ethernet. I need; besides modem and router.
1) A Streamer
2) A ethernet card specifically for audio jcat or matrix if I use my computer
3) Shielded ethernet cat 5 or better cable
So from wall to modem to router to streamer to dac, correct?