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.What’s Included: HD 400 PRO Studio Reference Headphone 3 m coiled cable with 3.5 mm jack plug 3.5 mm jack plug to 6.3 mm adapter 1.8 m straight cable Quick Guide Safety GuideMain Features:First Pro dedicated open-back headphones for professional mixing, editing and masteringA professionals tool with neutral sound reproductionLightweight design for all-day usageSingle-sided, coiled cable allows freedom to operate. Straight cable included as well for more compact applicationsAngled transducers designed for low distortion at high SPL provide a spacious and accurate soundstageSpecifications:Accoustic principle: dynamic, openEar coupling: circumauralEar pad material: VelourJack plug: 3.5 mm jack plug with 6.3 mm adapterImpedance: 120 Frequency response: 6 Hz to 38 kHz (-10 dB)Sound pressure level (SPL): 110 dB (1 kHz / 1 V RMS)THD, total harmonic distortion: < 0.05 % (1 kHz / 90 dB SPL)Weigth (w/o cable): 240 gTemperature:Operation: 15 C to +55 C (5 F to 131 F)Storage: 55 C to +70 C (67 F to 158 F)Relative humidity: 90 %