@maprik - there’s a German DIY website at ethernet.sound.com run by Eric who has done comprehensive testing on source components way upstream and made a wonderful discovery which should be shared and is currently spreading quick on the internet. The original posts begin here - you’ll have to translate from the German.
https://ethernet-sound.com/tp-link-tl-wr902ac-im-akku-modus-100ige-isolierung/
It’s all about WiFi performing at a higher level than hardwired LAN, through the use of a super low power super cheap Tplink pocket travel router and the benefit that WiFi brings through the creation of an isolating air gap between the noise-filled upstream components of modem and home router. The vital thing is the use of a power bank or battery supply to power the tplink, so as not to reintroduce electrical noise into the isolated circuit. In any case, it’s been picked up by the US DIY community, and keithc at WBF has started a thread on how to configure a basic set up for the use of the tplink in client mode - check it out ; ) -
https://www.whatsbestforum.com/threads/review-the-best-yet-most-affordable-network-switch-tplink-wr902ac.41708/
just to ally any fears of a big spend, the baseline upgrade of just tplink wr902 and accompanying power bank is about the greatest value to dollar delta around - I spent the equivalent of less than USD75 on the pocket router and romoss pea40 pro power bank, and it’s raised the sound realism of my already very high performing system by a good margin. Reports vary depending on how well one has already sorted/isolated their upstream noise, but regardless of where anyone is in their system build, everyone who has tried this WiFi fix has found conclusive improvement.
Keep in mind the quality of USB A to micro cable between power bank and pocket router matters, and don’t forget to take the power bank off the power outlet when listening to what should be a big difference. Enjoy!
In friendship - kevin