[. . . ] HD 497 Headphones | Wired Hi-fi Headphones General Description The HD 497 open, dynamic hi-fi stereo headphones deliver crystal-clear, well-defined treble and absolute precision across all audio frequencies. [. . . ] Technical Data Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . 24­22, 000 Hz (­3 dB/1kHz) Transducer principle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . dynamic, open Nominal impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Characteristic SPL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 dB (at 1 kHz, 1 Vrms) THD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 0. 2 % Ear coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . supra-aural Weight (without cable). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . approx. [. . . ] 005179 Features Open, supra-aural, dynamic hi-fi stereo headphones Excellent sound at home or on the move Balanced and very detailed sound reproduction with transparent treble Ultra-lightweight and comfortable for extended listening Rugged design High-quality neodymium magnets and lightweight diaphragms for powerful sound and rich bass Detachable connection cable made from highly conductive OFC copper Long service life due to easily replaceable parts such as ear pads and cables Recommended Accessories Stereo volume control HZR 62 Replacement Parts Ear pads (1 pair) Connection cable j j j j j j j j j j j Cat No. [. . . ]