Streaming from router via ethernet cable

[littlemac]

Hi, I have been searching the forum regarding this but all I find is threads about direct connect settings. 

I have a Mac Mini running Audirvana connected to an Airport Extreme with ethernet cable. I have connected my Devialet with an cable ethernet also and I'm running Devialet Air on the Mac. 

I have "told" Audirvana to use Devialet Air, set the Air software in OSX to use ethernet. Any suggestions on how to proceed or where I can find a walkthrough?

I have read that ethernet is supposed to sound better than USB and am eager to try it.

Cheers