Just bought the Sennheiser 6xx. How would this compare to the Schiit Magni/Modi stack? I'm planning to use my new setup for gaming and casual listening at my computer, if that helps.
This powers my Modded Fostex T50RP Mk 3 with no problem so I'm sure it will be fine for the 6xx. I also just got my Schiit Stack today and so far it's great. But The Xduoo is also portable and very easy to use with a phone or whatever. The main downside to the Xduoo is the drivers needed on Windows and Linux. The Schiit Stack is plug and play.
I run Antergos (based on Arch Linux) on my Ryzen desktop build and laptop, both can detect the XD-05 in USB DAC mode, plug and play basically. I use the XD-05 with Audacious using the ALSA plugin, bit-perfect playback, although there is some delay when switching between songs of different bit depth.
Interesting. Mine kept disappearing from ALSA. I ended up giving it to my wife to use on her Hackintosh. My Schiit Stack works perfectly on my Debian build.