Sennheiser HD820 Audiophile Closed-Back Headphones

£1,799.00 inc. VAT

Trade-in available.

Completely closed. Outrageously open. HD820 are audiophile-grade closed-back dynamic headphones by Sennheiser, which manage to fuse cutting-edge transducer capabilities with exceptional ambient noise attenuation, transcending the perceived limits of closed headphones.

Available in Black finish only.


* Usually ships within 1-3 business days. See exceptions

SKU: USV-SENNHEISER-HD820 Categories: , ,



Developed in Germany, the Sennheiser HD820 combines an innovative glass reflector and ring radiator transducer technology for a benchmark listening experience as vivid as it is uninterrupted.

Completely closed. Outrageously open. The Sennheiser HD820 fuses 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 the Sennheiser open-back designs. 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. This is due to the understanding that listeners are not isolated from their surroundings. HD820 sacrifices neither detail nor sound field thanks to its innovative acoustical systems in a closed, dynamic headphone.

A closed-back headphone able to produce the wide, natural sound field of an open design 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 HD820 is achieved with the use of precision concave glass reflectors — one terminating in 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 HD800S). While also a striking visual feature, the technical execution of the glass reflector yields a sound stage never before experienced in a sealed headphone.

The 56 mm ring radiator found in the HD820 leverages the key benefit of a large diaphragm transducer — air displacement — without losing the rigidity that favourably impacts rest and response times. Instead of a single attachment on the outer circumference of the transducer, both outer and inner edges of the ring are secured to the drive unit. The voice coil vibrates the diaphragm, connected to the V-shaped groove found near the centre of the ring.

The vibration-damping chassis and inert headband insert provide complete stability, resulting in astonishing speed and accuracy throughout the entire frequency spectrum. What you put into the HD820 is precisely what you will get out of it, too. Each transducer is manufactured, tested, and measured to an extremely tight tolerance to ensure the most dependable performance out of the box. Each HD 820 also includes the frequency response plot unique to that set’s serial number, sparing no resource to help you retrieve the most critical details from every corner of your music collection.


  • 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)
  • Sound Pressure Level (SPL): 103 dB at 1 kHz, 1V
  • Ear Coupling: Over-Ear
  • Jack Plug: 6.35 mm / 4.4 mm, XLR-4 (optional)
  • Cable Length: 3 m
  • Weight: 360 g without cable
  • Transducer Principle: dynamic, closed

Full Sennheiser Range Available

Unilet Sound & Vision are official retail partners for Sennheiser, providing sales, advice and assistance on their entire range of high-quality products, spare parts and accessories. Please do get in touch if you would like a demonstration or wish to purchase.

More Information

Additional information

Weight 0.360 kg


Purchase Options

Click & Collect, Trade-In Available



The name Sennheiser always stands for premium products. For artists, DJ's, scientists, sound technicians or demanding music-lovers, good sound is not enough - everyone wants to achieve the perfect sound.

Founded in 1945 by Dr. Fritz Sennheiser, the young company originally produced tube voltmeters for the electrical industry. However since their first microphone product in 1946, Sennheiser have aimed to make sound come truly alive.

Today, from superb headphones to industry-standard microphones and all-round audio solutions, their culture of innovation and a passion for excellence is helping shape the audio world of tomorrow.

Sennheiser | Unilet Sound & Vision


There are no reviews yet.

Be the first to review “Sennheiser HD820 Audiophile Closed-Back Headphones”

Your email address will not be published. Required fields are marked *