[. . . ] HD 25 SP Headphones | DJ & Studio Headphones General Description The HD 25 SP are closed dynamic headphones for monitoring, recording and outdoor applications. [. . . ] dynamic, closed Nominal impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Characteristic SPL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 dB (at 1 khz, 1 Vrms) Load rating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0. 2 W THD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 0. 4 % Ear coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . supra-aural Contact pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 N Weight (without cable). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 m, detachable, dual-sided steel cable Diffuse Field Frequency Response Features Very lightweight, comfortable even if used for long periods Effective attenuation of background noise High maximum sound pressure level 85 nominal impedance ensures universal compatibility Tough, detachable stranded steel cable Neodymium ferrous magnet systems and lightweight aluminium/copper voice coils for fast transient response j j j j j j j j j j Profile Closed dynamic headphones for monitoring in noisy environments, high sensitivity, sound pressure level 100 dB. [. . . ] 3 m steel cable with 1/4" (6. 3 mm) stereo jack plug. Recommended Accessories HZR 62 stereo volume control (for HD 25 SP-1 only) Replacement Parts Ear pads (1 pair) Velour ear pads (optional) (1 pair) Product Variants HD 25 SP-1: as HD 25 SP, but with 3. 5 mm / 1/4" stereo jack and 65 nominal impedance Cat. [. . . ]