I just tried straight out of my RME Fireface 400 sound card. Much more balanced but nowhere near as bright as I'm used to from any of my headphones, my Focal studio monitors or Wilson Alexias (paired with tube preamp and tube amps). Strange.
That said, they sound beautiful. Bass is pretty damn perfect: rich, deep, articulate and full of character - almost like a perfect blend of tube and solid state. I'm hearing LOTS of midrange ambience that I've never heard before. Black Cow from Steely Dan almost sounds weird at the beginning. Soundstage is not as big and airy as I hoped it would be (my Shure IEMs are bigger, but maybe that's to be expected?).
I just wish there was a little more up top, but again that could be my ears, what I'm used to etc.