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Sennheiser
Closed-back Reference Heaphones
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The critics said closed headphones could never sound as immersive as their open-air counterparts. They said physics would never allow it. To that Sennheiser simply said, “listen”. The HD 820 combines an innovative glass reflector and ring radiator transducer technology for a benchmark listening experience.
The HD 820 fuses Sennheiser's cutting-edge transducer capabilities with exceptional ambient noise attenuation, transcending the perceived limits of closed headphones.
An achievement in its own right, the 56mm ring radiator found in the HD 820 leverages the key benefit of a large diaphragm transducer—air displacement—without losing the rigidity that favorably impacts rest and response times.
The HD 820 delivers on long-term wearing comfort too, providing a listening experience as plush as it is immersive.
Frequency response (speaker): 6 Hz - 48,000 Hz
Sound pressure level (SPL): 103 dB (1 V)
Impedance: 300 Ω
Total harmonic distortion (THD): < 0.02% (1 kHz, 100 dB)
Cable length: 3 m
Adapter: XLR-4, balanced, 4-pin Stereo jack plug: 1/4" (6.35 mm), unbalanced, 3-pin 4.4 mm, balanced, 5-pin
Transducer principle (headphones): dynamic, closed