ESP950 Electrostatic Headphones The pinnacle of audio reproduction, the Koss ESP950 Electrostatic headphone system sets the standard for electrostatic headphones. Not only do these professional headphones provide extremely low distortion, they also offer unbeatable sound quality and reproduction for an utterly unique listening experience. The ESP950 feature Koss’s revolutionary electrostatic transducer design, which includes unique materials and construction for mechanical damping and a proprietary semi-conductive diaphragm coating for an ultra-flat frequency response across the entire range. That means deep, clean bass with remarkable power and unmatched sound quality. What else would you expect from the people who introduced the world to private listening? Features: Electrostatic transducers deliver clean bass and unmatched sound quality Pivoting ear cups and an adjustable/detachable headband ensure ultimate comfort and convenience Straight, dual-entry 4 foot cord with 6 foot extension Includes energizer, battery pack, leather carrying case, connecting cables and 120 VAC adapter Covered under the Koss Stereophones Limited Lifetime Warranty Specifications: Frequency Response 8-35,000 Hz Impedance 100k ohms Sensitivity 98 dB SPL/1mW Cord Straight, Dual Entry, 4ft