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It's not about impedance. It's about impedance and efficiency and whether the headphone needs voltage or current.
The RME cannot drive 300 ohm Sennheisers well. I suspect it cannot drive 250 ohm Beyers well either. And if somebody tells you it can then we need to know what other amps he heard those with, because a lot of people have no ideas what the cans are capable of since they never heard them out of an appropriate amp,
These cans were not made for portable devices or low voltage amps. They were made in the days before headamps were available. People used integrated amps and receivers that had enough voltage. From what little I can tell, 300 ohm Sennheisers need a voltage swing of around 15V to start sounding really good.
Some headphones the RME can drive well are Fostex and Audeze LCD-2C.
I also heard my Sennheisers on my Violectric V281 and Bottlehead Mainline and didn't hear any difference, well besides the tube sound on the Mainline.
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