Professional drivers - clear sound in the studio and beyond Our K92 headphones offer an authoritative, extended low-frequency response that lends definition to kick drums and bass guitars. At the same time, the detailed yet precisely balanced high-frequency response reveals the nuance of vocals, guitars and acoustic instruments. The K92's generous 40 mm drivers offer the highest sensitivity and widest frequency response of the K52 and K72, resulting in a powerful output that reveals every detail. The K92s also feature a low-impedance design for compatibility with a wide range of playback devices, from professional studio equipment to portable music players.