Here’s my current setup. I’ve tried a microRendu with a Dragonfly v1.2 in parallel with the RPi + IQaudio, but without being able to hear any difference.
I’m thinking of replacing my Quad 44 + 405 combo with a Quad Artera Link + Quad Artera Stereo, once the Artera Link is available. I’ll keep the microRendu until then, and see whether it works better with the Artera Link. However, the Artera Link is itself a networked device, so it may well render the microRendu superfluous. On the other hand, I’ve been told by Quad that the Artera Link will not be Roon Ready, so I’m not yet sure whether it will work with Roon… Time will tell.
Edit: Network layout shown above is as per September 2016.