Audio engineer Raphael Pulgar has written this detailed review about the 250 Ohm version of the Beyerdynamic DT 770 PRO closed back headphones that he uses in his studio.
Beyerdynamic DT 770 Pro 80 Ohm Review - I like this one better
Review: Beyerdynamic DT770 Pro Headphones - Music Studio DIY
Studio Headphones Diffuse-field equalised Closed-back Circumaural design Dynamic Impedance: 250 Ohm Sensitivity SPL (sound pressure level): 96 dB
beyerdynamic DT-770 Pro 250 Ohm
Beyerdynamic DT770 Pro (80 ohm) Review - Beyer's Finest
DT 880 Chrome Review 250 ohm (Modded?) : r/headphones
Beyerdynamic DT 770 PRO (80Ω) review - SoundGuys
Studio Headphones Diffuse-field equalised Closed-back Circumaural design Dynamic Impedance: 250 Ohm Sensitivity SPL (sound pressure level): 96 dB
beyerdynamic DT-770 Pro 250 Ohm
beyerdynamic DT 770 PRO Studio Headphones - 250 Ohm
Beyerdynamic DT 770 PRO-250 Closed Studio Headphones Reviews
Beyerdynamic DT 770 Pro 250 Ohm Review
BEYERDYNAMIC DT 770 PRO 250 OHM
Beyerdynamic DT 770 250 Ohm Studio Headphone Review - Sonarworks Blog
Studio Headphones Diffuse-field equalised Closed-back Circumaural design Dynamic Impedance: 250 Ohm Sensitivity SPL (sound pressure level): 96 dB
beyerdynamic DT-770 Pro 250 Ohm