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Sennheiser HD 820

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The HD 820 fuses Sennheiser's bleeding-edge acoustic capabilities with exceptional reduction of ambient noise. Until now, the audiophile headphone experience could only begin with an open back design or loudspeakers. The HD 820 sacrifices neither detail nor sound field by using breakthrough acoustical systems in a closed, dynamic headphone.

  • The HD 820 delivers an unparalleled, reference-grade audiophile listening experience in a closed headphone
  • Innovative glass reflectors and frequency absorber systems replicate the wide open characteristics of audiophile speakers in a sealed earcup design
  • 56mm Ring Radiator transducers and Glass Reflectors provide total immersion in your music with absolute detail and a breathtaking soundstage
  • Made in Germany using the finest materials for sound integrity, build quality, and luxurious comfort
  • Reference-grade audiophile sound quality
  • Closed, noise isolating design for luxuriously private listening
  • Made in Germany from purpose-built materials
  • Ring Radiator transducers for incredible detail and extension
  • Glass Reflector plates with internal absorber system mimic the open sound of loudspeakers

Headphone Profile



Sennheiser HD 820

Developed and manufactured in Germany, the HD 820 is a closed, reference-grade audiophile headphone that a combines an innovative glass reflector and Ring Radiator transducer technology for a benchmark listening experience as vivid as it is uninterrupted.

Into the great wide open

The technology of transparency

The breakthrough transparent performance of the HD 820 has been achieved through a special innovation: Their legendary Sennheiser Ring Radiator transducers are fitted with unique glass covers. Revealing the great look of the technical component within, this visually striking feature was actually developed wholly in service to the sound: The concave glass reflects the sound waves from the rear of the transducer to an absorber, which results in minimal resonance. Thus, the sound waves are effectively “gone” like they would be in open headphones.

The technology of transparency

An all-star team of excellent components

Made in Germany, the HD 820 stand apart also because of the extraordinary attention that is given to every detail: From the extra comfortable handcrafted ear pads that insulate the listener from ambient noise, to the silvercladded OFC cables and gold-plated plugs, to the robust metal headband with an inner damping element. This package offers an unparalleled listening experience, which can even be improved by the Sennheiser HDV 820 amplifier for dynamic headphones – the perfect companion to the HD 820.

An all-star team of excellent components

Audiophile connectivity

Only what gets in can eventually get out. That’s why the HD 820 come with a specially tuned symmetrical, impedance-matching cable with low capacitance and a balanced 4.4 mm gold plug, which offers superior characteristics in contact resistance, and thus in sound.

Audiophile connectivity

The look of superior quality

A well-conceived audio component always looks good – inside and out. With their unique glass covers the HD 820 display all the evidence to prove this. They are an aesthetical timeless classic and a natural technical beauty.

The look of superior quality

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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