Beyerdynamic DT 900 PRO X Open-Back Studio Headphones The Beyerdynamic DT 900 PRO X Open-Back Studio Headphones with Stellar.45 Driver for Mixing and Mastering are engineered for audiophiles and music creators who demand exceptional sound quality and comfort. With its innovative STELLAR.45 driver, this headphone set delivers remarkable performance across all playback devices, making it the ideal choice for mixing and mastering in any environment. Unmatched Sound Quality Experience crystal-clear