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The Beyerdynamic DT 770, 880 and 990 even as 600Ohm version does really fine with the Fiio E10K. Its one of the msot recommended DAC for those headphones in audio forums.
The Fiio E10K actually is only 150Ohm but like I said it does pretty well in combination with Beyerdynamic DT 770, 880 and 990. I used 600Ohm for a while on that DAC and it had no real difference.
PS: In fact I used the 770 250Ohm even on a 32 Ohm cellphone for a while. Was still fine.
https://www.audiosciencereview.com/forum/index.php?threads/measurement-and-review-of-fx-audio-dac-x6-dac-compared-to-topping-d30-and-fiio-e10k.2097/
https://www.amazon.com/Creative-Sound-Blaster-System-Preamp/dp/B004275EO4/ref=as_at?creativeASIN=B004275EO4&linkCode=w61&imprToken=mDUrRxadoWbGww5-RvZNvQ&slotNum=4&tag=best-usb-dac-under-100-20