The reason why microRendu doesn't is have multiple outputs is because every cent is engineered into optimizing the sound of its USB output beyond what is on just about every other USB output, including its use of Swenson's Regen tech.
So @lustformusic , when you say that Dac8 (or any other) sounds better with AES have you tried that vs. USB fed from a microRendu? I would argue that the improvements made probably beat any other source via AES into Dac8. I have no doubt about your assertion using other sources. Cheers,
Spencer