When working at home or in the studio, you need your mix to sound as it does when your listeners hear it. The HD 400 PRO open-back studio headphones provide a natural and accurate listening experience for fine tuning your signature sound. Its lightweight design and velour earpads provide the comfort you need during long sessions. In addition, open ear cups and angled transducers allow for a wide and transparent soundstage, making the HD 400 PRO a reliable companion for those who put quality and precision above all else. Impedance 120 Ω Frequency response 6 Hz to 38 kHz (-10 dB) Sound pressure level (SPL) 110 dB (1 kHz / 1 V RMS)