I better hope they perform well for their €215 euro pricetag.
Because if they don't sound good, I'll immediately return them.
Don't wanna be disappointed again like when I bought the AKG K540 2 years ago.
Judging cans with onboard soundcard and little burn-in is not smart thing to do. Difference between onboard and separate DAC/Amp can be pretty huge. Haven`t done comparing between my onboard HD Audio VS. my external DAC`s with X1 but I know the jump from onboard HD Audio to Aune T1 or even cheap ELE EL-D02 DAC/Amp made a pretty huge difference in sound. Doesn`t really matter which cans You use, difference is still quite big. Imo X1`s require at least 150h burn-in time with little amping to sound to its best.