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2 Years Limited Warranty (T&C applies, warranty excludes human factor damage)


HD 820 – The critics said closed headphones could never sound as immersive as their open-aire counterparts. They said physics would never allow it. To that we simply said, “listen”. Developed in Germany, the HD 820 combines an innovative glass reflector and ring radiator transducer technology for a benchmark listening experience as vivid as it is uninterrupted.

- The new audiophile standard for closed-back headphones
- Ring Radiator transducers
- Unique innovative glass transducer covers minimize resonances
- Incredible realistic, natural sound field
- Robust metal headband with inner damping element
- Handcrafted comfortable microfiber ear pads
- Developed and made in Germany
- Silver-cladded OFC cables and gold-plated plugs
- Impedance: 300 ohms
- Frequency Response: 12 - 43800 Hz (-3 dB), 6 - 48000 Hz (-10 dB)

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. Until now, the audiophile headphone experience could only begin with Sennheiser’s open back design—a design that paved the way for an entire class of precision listening devices. This standard of sound reproduction would go on to surpass hi-fi systems exponentially larger in size and cost with the understanding that listeners would not be isolated from their surroundings. The HD 820 sacrifices neither detail nor sound field thanks to its innovative acoustical systems in a closed, dynamic headphone.

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. While sealed headphones offer the utmost privacy, redirected energy can create resonance and distortion within the ear chamber. The reference-class experience of the HD 820 is achieved with the use of precision concave glass reflectors—one terminating each earcup. Located on the outer plane of each ring radiator transducer, this functional plate reflects energy from the rear of the driver to a specially tuned absorber system, allowing the waves to mimic the behaviour exhibited in open-air models such as the HD 800 S. While also a striking visual feature, the technical execution of the glass reflector yields a sound stage never before experienced in a sealed headphone.

What's in the box?
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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