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 Sennheiser HD820 Closed Dynamic Headphones


The new audiophile standard

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.


Completely closed. Outrageously open.

The HD 820 fuses our cutting-edge transducer capabilities with exceptional ambient noise attenuation, transcending the perceived limits of closed headphones.


Reflecting within

A closed back headphone able to produce the wide, natural sound field of an open one requires rethinking the directional characteristics of sound waves.


Fellowship of the Ring

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 favourably impacts rest and response times.


Exhaustive engineering

The deep, almost magical stereo imaging of the HD 820 is the sum of the exhaustive engineering poured into it.


An Ergonomic Treat

The HD 820 delivers on long-term wearing comfort too, providing a listening experience as plush as it is immersive.


It's all about connection

As a centerpiece of your constantly evolving rig, your go-to headphones should offer the versatility to listen on your terms.


• Reference class open-back audiophile headphones
• Closed-back earcups
• 56mm ring radiator transducers
• German craftsmanship
• Detachable cable





    • The new audiophile standard for closed-back headphones
    • 56mm Ring Radiator dynamic transducer system
    • Concave Gorilla Glass reflectors deliver impressive spatial sound reproduction
    • Acoustic absorber system prevents frequency masking for unheralded detail
    • Ultra-ergonomic adjustable metal headband with inner damping element
    • Luxuriously comfortable microfiber ear and headband padding on key contact points
    • Developed in Germany and precision-built at Sennheiser’s state-of-the-art Ireland plant
    • Impedance: 300 ohms
    • Frequency Response: 6 - 48,000 Hz (-10 dB)
    • Total harmonic distortion: 0.02 % (1 kHz 1 Vrms)




    Sennheiser HD820

    • Specifications:


      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   dynamic, open


      Weight   360 g


      Ear coupling   circumaural


      Magnetic field   10.5 mT


      Article number (SKU)   507435


    • • Headphones HD 820 (closed, dynamic headphones)

      • connection cable: ¼” (6.35 mm) stereo jack plug (connected ex works), unbalanced

      • 4.4 mm stereo jack plug, balanced

      • USB flash drive (SD-U16L version) with instruction manual (as PDF file) and individually diffuse-field frequency response curve

      • instruction manual

      • storage box

      • microfiber cloth

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