What is the highest ohm headphones that the UR44C's will support without a headphone amp?

I’m picking out some headphones for my UR44C. I want to know the max ohms I can go without requiring a headphone amp or sacrificing on clarity/separation. I am not extremely concerned with volume as I listen at low levels.

It probably depends on what you consider “sufficient headroom”. I wouldn’t go above 80 ohms with any desktop interface.

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It depends more on the type of the headphone than on the real impedance…
My Beyer DT770pro 250ohm work very well with my UR22.

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