With a run that long you would benefit from fiber and a good Ethernet cable on the streamer end. I recently replaced my 30 foot Cat 6 with fiber and Cat 8 cable, it was a significant upgrade in sound. And cheap to try, around $120 on Amazon. There is a discussion in this forum with links to gear, worth a try.
What can I do between the wall and my streamer/DAC?
I have AT&T fiberoptic internet and the AT&T supplied router. I then have generic ethernet cable to the music room in the basement to the back of my Lumin T2. Is the anything I can do to make this a better sounding situation? I feel it sound very good as is, just wondering if I am leaving some goodness on the table with this set-up, Thanks, Allen.