I tried a cheap fiber optic setup but didn’t like it. Maybe you have to spend more money.
A friend sent me a LHY network switch to try, and I could hear a difference but again didn’t like what it did. He also sent me an EtherRegen, and I liked that--a lot! I found a used one for sale and I like what it does for my IanCanada streamer, even with the stock power supply. Soundstage, imaging, background noise all much nicer and the sound has a more analog feel. Tomorrow I’m receiving a used Afterdark clock and LPS. I’m interested to see what that does.
Alpha-audio.net has a review of stock network switches. I bought the Netgear and it’s a small but noticeable improvement over what I was using.
https://www.alpha-audio.net/review/a-very-deep-dive-into-network-switches-listening-and-measuring/
I haven’t fussed with ethernet cables yet but I guess that’s next. ;-)

