2 days ago I bricked my usual router which is the Ubiquiti EdgeRouter X. it is by far the best sounding router I've tried so far. As a temporary solution I had to connect the old router which was Buffalo WZR-1750DHP and what happened was a drastic degradation of the sound. Everything became lighter and drier, there was a big loss of dynamics, the bass lost it's texture, the image became smudged. It was quite shocking as the router is in a different room, on a different AC grid, it is used only as a wired router (no wifi - for wifi I have a separate Access Point), the router is powered by a linear PSU (the same it powered the Ubiquitii). So the router was the only variable.
What is surprising that the difference is with local files directly on my Audio PC - no streaming, no loading of music tracks off a NAS, no transfer of music related bytes on the network. Just control packets between Bubble UPnP on my tablet and JPLAY FEMTO on my Audio PC.
If I had enough space, I'd assemble a PC with JCAT NET Card and a linear PSU to act as a router.
What are you guys using as routers?