Features The new audiophile standard for closed-back headphones56mm Ring Radiator dynamic transducer systemConcave Gorilla Glass reflectors deliver impressive spatial sound reproductionAcoustic absorber system prevents frequency masking for unheralded detailUltra-ergonomic adjustable metal headband with inner damping elementLuxuriously comfortable microfiber ear and headband padding on key contact pointsDeveloped in Germany and precision-built at Sennheiser’s state-of-the-art Ireland plantImpedance: 300 ohmsFrequency Response: 6 - 48,000 Hz (-10 dB) Total harmonic distortion: 0.02 % (1 kHz 1 Vrms)