 The Sennheiser HD280 Pro Headphones. DJ and Studio Headphones with good isolation. The Sennheiser HD280 Pro circumaural headphones are closed-back, designed for professional monitoring applications. Although suitable for a very wide of applications, the exceptional 32dB attenuation of ambient noise makes the Sennheiser HD 280 PRO headphones particularly useful for use in high-noise environments.  Transducer principle: Dynamic, closed Nominal impedance: 64 Ohm Sound pressure level (SPL): 102 dB (IEC 268-7) Load rating: 500 mW THD, total harmonic distortion: 0,1 % Ear coupling: circumaural Contact pressure: 6 N Weight w/o cable: 220 g Jack plug: 3.5 mm stereo mini jack plug with adaptor to 1/4 inch (6.3 mm) stereo jack plug Connection cable: Coiled cable (min1m/max 3m) Frequency response (headphones): 8 - 25000 Hz | 
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