What about a mesh network? If you have to have ethernet, you could put a mesh node near to your stereo - most have ethernet ports.Ah ok, appreciate what you're saying - I can try that just to see if the server/usb/ DAC with no network sounds different.
However, I would have to live with the difference either way as I don't have a viable alternative to homeplugs.. I'm not willing to have cables all over the house- drilling between floors etc.