Sennheiser HD 820

General Information

With these groundbreaking closed dynamic headphones passionate music lovers can now enjoy their music at an audiophile level wherever they please, at home or on the move. Featuring unique glass transducer covers that minimize resonances, the HD 820 are simply the most transparent-sounding closed headphones in the world, extending the boundaries of what has been achieved in sound reproduction with closed type headphones up to now.

The new audiophile standard for closed-back headphones

For audiophiles there wasn’t any doubt: When it came to circumaural headphones the very best sound required an open back design. This axiom has now been rendered obsolete by the youngest member of the Sennheiser Audiophile Range: The closed dynamic HD 820 employ an innovative technology that makes them sound breathtakingly transparent and natural. Developed and made in Germany, they offer an incredibly realistic, natural sound field and also stand apart by the extraordinary attention given to every detail of their design. Their soft comfortable microfiber ear pads are hand crafted, providing excellent attenuation of ambient noise, while the robust metal headband includes an inner damping element. Get ready for an unparalleled listening experience.

Into the great wide open

Vivid, wide, transparent, natural. The sound field of the HD 820 is wide open. Which is not what you would expect at all from closed circumaural headphones. With the HD 820 you can explore and rediscover your music in absolute reference-class quality without intruding on the aural comfort zone of others. Thus, the HD 820 not only open up the sound field, but also new places and opportunities for you to enjoy your music.


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.


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.


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.


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.


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 Pentaconn 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
  • XLR-4 connector, balanced
  • Technical Data
    • Impedance
      300 Ohms
    • Frequency response (Headphones)
      12 - 43800 Hz (-3 dB)
      6- 48000 Hz (-10 dB)
    • Sound pressure level (SPL)
      103 dB at 1 kHz, 1V
      • Ear coupling
        around the ear
      • Jack plug
        6.3 mm / Pentaconn / (XLR4)
      • Cable length
      • Weight
        360 g without cable
      • Transducer principle (headphones)
        dynamic, closed
      • Noise cancellation
        up to 26 dB (passive)

Latest reviews


100+ Head-Fier
Pros: Punchy low-end
Musical mid-range, great for heavier styles of music
Highs are there but not overly bright or thin
Comes with three great cable options (4-pin XLR, 4.4mm, 1/4"
Cons: Horrible fit (for my head)
Price: Not worth $2400 for a mass-produced product. Maybe with some cooler materials like titanium or carbon fiber or carbon-reinforced plastic.
Now that I've descended into the rabbit hole that is high-end headphones, I picked up a pair of HD820s to A/B against my others (Sony Z7M2, Focal Elear, Focal Elegia). Sound-wise, the HD820 are clear winners. The tonality is perfect, the low-end is punchy, the mid range lets guitar breath without sounding too crunchy, and the highs don't seem harsh. The frequency response on these is great for my preferences and listening to heavier styles of music (rock, metal, prog). They also do sound great for other, softer genres. And I like the included cables—three different options, all plenty long. Most stock cables are too short, so this is great. Sound-wise, I'd give them 4 stars. That said, one glaring problem is the fit.

Absolutely the worst fitting headphones I've tried. One star. It's just me. My head is narrow and long, so there's barely any clamping force. If I move my head at all (up, down, left, right) the headphones slosh around. If I open my mouth, swallow, or yawn the headphones move around. I have to remain perfectly still and that's no bueno.

If I put slight pressure against the ear cups with my fingertips, it's perfect. The sound is awesome. Bass hits like a sledgehammer. But just wearing them without holding them, there's less bass from the loose fit. If the ear pads/cushions were a little thicker, that would solve the problem. This would put pressure against the headband, increasing clamping force. Maybe a third-party company will come out with thicker pads at some point. I'm going to keep these headphones though just because they sound so good, and deal with the fitment somehow.

Compared to Focal Elegia
They both have a similar mid-range emphasis to my ears. Not squawky or honky. But they definitely aren't scooped or U shaped. High-gain, distorted guitar doesn't sound fizzy or buzzy or thin. Instead, these cans bring out that muscular growl that most heavier styles of music rely upon. However, the HD820 are more balanced than the Elegia since—unlike the Elegia—they have a prominent low-end thump and a bit more air in the high end. The Elegia sound almost like an AM radio in comparison. I can correct this by adding EQ. But without EQ the HD820 takes the cake. The Elegia also breaks up and distorts easier. The HD820 seems to have a bit more headroom before the low-end flubs out. Kick drums are beastly and clean.

Compared to Focal Elear
Being open back, the Elear certainly have more air and space. They are sweeter sounding. Great for more chill styles of music. They do fine for heavy stuff, but the HD820 have them beat in that department. The Elear break up even sooner than the Elegia. It's easy for bass and drums and high-gain guitar to all mush together into a farty mess with these things, even at low volumes. Elear have more bass than Elegia though. But lack the prominent mid-range bias the Elegia and HD820 have. I should also mention that the Focals fit much better. Good clamping force, thick pads, easy to get a seal around my ears.

Compared to Sony MDR-Z7M2
Fit, like the Focal, is great. lightyears better than the Sennheisers. Incredibly comfortable. Sound wise, They have a nice punchy low end, but it's not as hard-hitting as the HD820. A bit softer and lush sounding. Like a thick hot cocoa. It's deeper. But has a longer decay maybe? Mid-range is incredibly scooped and smooth. Highs are pronounced and a bit thin at times. More headroom than the Focals, but not as much as the Sennheisers. If the the Z7M2 had the Elegia's prominent mid-range, they would sound pretty close to the HD820, just not as surgical and tight.

Surgical. Tight. Punchy. Musical. That's how I would describe the HD820. They are like the Porsche GT3 of the headphone world. Purpose-built. No frills. Exciting. I just wish the fitment were better for my head. The headband could use a redesign to make the clamping force better or at least more adjustable.


New Head-Fier
Pros: Soundstage, detail, comfort
Cons: Does not get my head nodding, too analytical and a bit cold
This will be my first review so bear with me :relaxed:

I’m currently looking for a replacement for my B&W P7. I have used them directly connected to smartphones and been happy with the sound on these. But after getting a Chord Hugo2 I can really hear the limits of the P7. They are not bad but you sense there is so much more from Hugo2 that is missing from them. So after reading lots of reviews of over ear headphones I narrowed the list down to HD800S, HD820, Focal Clear and Utopia. One of my requirements where weight, they should not be too heavy.

Visited a dealer shop in Stockholm and listened to HD800S, HD820 and Focal Clear.

So my comparison will be from these two. I’t no use comparing to P7 as these are in another league.

I’m using my smartphone (Huwaei Mate 8) with an app called USB Audio Pro, connected via USB OTG to Hugo2. Music are Flac files with different sample rates from 44.1KHz to 96KHz, 16-bit and 24-bit. No external amplifier is used, only Hugo2.

First impression of HD820 is that they have and unbelievable sound stage, though a tad bit smaller than HD800S but not by much. You can head every instrument clearly and it has it’s own spot which no other instrument intrudes in. So there is no problem following a violin or a low sounding instrument regardless of volume of more frontal instrument or singer.

Lots of reviews say HD820 (and HD800S) sounds a bit cold. I can agree here they have a coldish sound in the middle highs. It feels a bit sterile to my ears.

I was a bit worried that I would feel they lacked bass as my P7 are rather bass focused and I enjoy feeling bass on some tracks. But I was positively surprised, they are no booming headphones but the bass is clean and distinct with lots of details. So I did not miss out at all.

Comfort then, yes they are very light and they sit very relaxed around the ears. I had a 4 day stubble so the ear pads where stuck even when moving my head around Don’t know if they would do the same newly shaved…. It felt like the headphones just disappeared after having them on a while. So comfort is very good.

For me both HD820 and HD800S are fabulous headphones but they do not engage me in the music they are more for listening and analysing every detail and instrument in a track.
HD820 has a bit more bass and slight narrower sound stage than HD800S.
If you are a car enthusiast like me you could compare both HD’s as a McLaren, very precise and correct but not so envolving. While Focal Clear was more like Lamborghini, more fun and envolving, gets my head nodding with the music :L3000:
Man I know what you mean, I demo’d the hd800s and focal clear, and found the hd800s to be quite clinical. Took the clears home, although I’d say technically the hd800s is better. By the way, if you want an even more engaging, head nodding (and imo better) listen than the focal clears, grab some bowers and wilkins P9 :) you wont be dissapointed as a P7 fan



Formerly known as Drumkrunk
I said what I wanted to say and I feel that these look amazing and I waited forever for a closed version of the 800's, I think i'll have to get the open back now and try and trap some sound leak via modifying.


Repelling digital infidels. (Would that be called the Digifadah?)
Yep gotta keep those new versions coming. Headphone making is a lot like textbook publishing I guess.


Nice press release. I owned the HD800 and could never resolve the EQ problem (some say it is a recessed mid which exaggerates the 6khz region). It was also very uncomfortable on my head. After 40 minutes of listening, the vice from my head had to be removed. Lastly, the HD800 needs a very good headphone amp pairing. Although I loved the HD800 for nearly three years, I couldn't live with it and I had to let it go. I anticipate the HD820 being great and that might be the biggest problem for me. Sennheiser sets expectations incredibly high.


100+ Head-Fier
What's the difference with the HD800 S, besides the glass cover? Why $1000 more expensive?
Its the trend the headphone manufacturers are heading. With these flagships getting more and more expensive like the LCD-4 and Utopia it only makes sense that Sennheiser did the same. If the HD800 and HD800s came out today I'd willing to bet they would be priced at over $2500 USD.
What's the difference with the HD800 S, besides the glass cover? Why $1000 more expensive?
The HD800 has long been priced far below what it could be on the market. It is one of the better bargains in HeadFi. I think the $1000 price hike is due to several factors: significant R & D, keeping up with market conditions, and need to have a headphone that is a prestige statement below their HE1.