[. . . ] [. . . ] Features Audiophile, Open-AireTM, hi-fi stereo headphones Superbly natural, spatial sound reproduction Award-winning BioNetic design offers an ergonomically correct fit for maximum comfort Duofol technology* Fully modular - replaceable parts for long life New dampening element for controlling the diaphragm oscillation, optimally matches the headphones to all sound sources Computer-optimized magnet systems minimize harmonic and intermodulation distortion Detachable, robust, single-sided connection cable made from kevlar-reinforced oxygen-free copper Velour ear cushions 2-year warranty HD590 Prestige Technical Data Transducer Ear coupling Frequency response (-10 dB at 1 kHz) Characteristic SPL THD Nominal impedance Weight (without cable) Connection cable (detachable) Connector Dynamic Circumaural, Open-Aire 12-38, 000 Hz 102 dB <0. 1% 120 approx. 3 m (10 ft. ), single-sided, OFC cable 1/8 stereo mini jack with 1/4 adapter * The Duofol diaphragm is a special design developed by Sennheiser which fuses two diaphragm materials to virtually eliminate standing waves in the capsule. Replacement Parts Ear cushions Headband Headband cushion Driver elements Cable Delivery Includes 1 HD 590 headphone with single-sided cable lit# L10017 January 1999 SENNHEISER ELECTRONIC CORPORATION, ONE ENTERPRISE DRIVE, OLD LYME, CT 06371 TEL:860-434-9190 FAX:860-434-1759 CALIFORNIA: 4116 WEST MAGNOLIA BLVD. , SUITE 100, BURBANK, CA 91505 - TEL:818-845-7366. CANADA: 221 LABROSSE AVE. , PTE-CLAIRE, PQ H941A3 - TEL: 514-426-3013 . [. . . ] [. . . ]