Professional Monitoring Headphones with True Bass Response 'Front Row' Sound ImageType: Dynamic, closedback. Driver: 50mm, neodymium. Sensitivity: 98dB SPL (1mW). Frequency Response: 1030,000Hz . Max. Input Power: HD662: 200mW ; HD662F & HD662B: 300mW . Rated Impedance: 32 (Coppercoated