If you are going to use the Hegel as the DAC then the U1 Mini is the proper choice. The D2 does MQA fully the U1 Mini just like the Zen does not.
Hegel HD25 w/Innous Zen mini mk 3 vs Lumin D1 w/Roon Nucleus
I have set up the rest of my system and needed to get some advice. I wasn't sure if I should get the Innous Zen mini mk 3 which I'd use as a roon core and streamer and run the signal through a Hegel HD25 or if I should get a Lumin D1 and couple it with a Roon Nucleus? I had seen the U1 mini too but figured that this wouldn't make much sense since the HD25 can't handle MQA which I figured would be a big plus for the Lumin.