Just ordered an optical link setup, cat in, optical out, run 25 feet, optical in, shielded short patch cable, then to streamer.
The theory sounds reasonable. The analog noise will be removed and interference on the long run minimized so the end point signal should be “cleaner” than a long copper cable.
Was right at $100 to try it out, so, not a big investment to see if there is an audible difference.
Newegg, pair of mediaconverters $49
Optical cable: $32
Short shielded cat6, 99.9% ofc, gold plated:$7
plus tax etc…