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
DT 770 Studio 80 ohms? Are these guitar centers version? | Headphone Reviews and Discussion - Head-Fi.org
Amazon.com: beyerdynamic DT 770 Pro Studio Headphones - Over-Ear, Closed-Back, Professional Design for Recording and Monitoring (80 Ohm, Grey) : Musical Instruments
Beyerdynamic DT770 Pro 32 Ohm Review — A more Portable-Friendly DT770? | by Alex Rowe | Medium