Amazon.com: beyerdynamic DT 770 PRO 250 Ohm Over-Ear Studio Headphones in Black. Closed Construction, Wired for Studio use, Ideal for Mixing in The Studio : Musical Instruments
Beyerdynamic DT770 vs. 880 vs. 990 [Definitive Guide] - Home Studio Basics
Beyerdynamic DT-990-PRO-250 Open Back Studio Headphones + Tube Headphone Amp - Rockville Audio
The 3 Best Portable Headphone Amps With Built-In DAC of 2023 | Reviews by Wirecutter
Got DT 880 250 ohm and can confirm the fact that portable DAC can't drive them at all :) : r/headphones
beyerdynamic DT-990 Pro 250 Ohm – Thomann United States
Does Scarlett 2i2 Work With 250 Ohm Headphones? - YouTube