The Sennheiser HD 599 SE are open-back around-ear headphones featuring an audiophile-grade sound signature. They have an impedance of 50 ohms and a frequency response range of 12-38,500 Hz, delivering detailed audio reproduction across the audible range. The open-back design provides a spacious, natural soundstage. The earcups and headband padding are covered with soft velour for long-wearing comfort. The detachable cable is 3 meters in length and includes a 6.3mm adapter for home audio use. Overall, the Sennheiser HD 599 SE headphones offer an immersive listening experience for critical music enjoyment.