Beyerdynamic - 'DT 990 PRO' Headphones, Open Back, Over Ear, 5 - 35,000 Hz Respo
Without exception, beyerdynamic manufactures the dynamic transducer systems that go into their headphones in-house. beyerdynamic’s DT 770 PRO, DT 880 PRO and DT 990 PRO headphone series has it’s roots in the early 1980s.