Beyerdynamic DT 990 Premium Edition 600 ohm Open Studio Headphones | Sweetwater
Amazon.com: beyerdynamic DT 990 Edition 600 Ohm Over-Ear-Stereo Headphones. Open design, wired, high-end for use with headphone amplifiers : Electronics
Beyerdynamic TS 600 UHF Bodypack Transmitter for Opus 600 701076