TheBeyerDynamic DT990 PRO 250 ohm Open Studio Headphones is an open dynamic headphone for studio applications. Due to a weight reduction of the diaphragm an excellent sound reproduction quality is achieved. Its rugged design with a spring steel headband ensures a secure fit and withstands all demands. Soft headband and ear cushioning systems ensure a high comfort over long periods of time. beyerdynamics DT PRO headphone series has its roots in the early 1980s. Since then, millions of audio professionals from all parts of the world have become loyal users of beyerdynamic products. The series has been designed to cater for listening in a wide variety of environments, thanks to different headphone construction.