so to help answer your question I used to own the lumin x1 and I now own the lumin u2 (love lumin as a streamer but wanted to try different dacs)
I setup a fiber connection with the x1 for very cheap. I think with all the parts it was just over $100
Now, today I will (depending on the weather since its been snowing a lot) take possession of an etherregen switch with afterdark linear power supply and external dedicated clock. I will also be trying out the u2 configured with fiber optic. apparently, even the Transceiver Module makes a difference and has sonic characteristics so I have upgraded versions of these as well
Hopefully over the weekend after a long listening session i will be able to give you feedback but even with the dirt cheap switch and parts on the x1, it sounded great and noticeably better than its non optical counterpart.
so rest assured and dont be worried it will sound fantastic and you honestly dont need to spend very much money on a switch, cable, and transceivers
will the upgraded network parts make a difference? stay tuned and i will give my feedback