Sennheiser
The new audiophile standard.
HD 820 Audiophile Headphones
The critics said closed headphones could never sound as immersive as their open-air counterparts. They said physics would never allow it. To that we simply said, “listen”. The HD 820 combines an innovative glass reflector and ring radiator transducer technology for a benchmark listening experience.
Tech Specs
- Headphone Type: Wired Over-Ear
- Connection Type: 4.4 mm plug (balanced); 6.35 mm plug (unbalanced)
- Impedance: 300 Ω
- Driver Diameter: 56mm
- THD: ≤0.02 % (1 kHz, 100 dB SPL)
- Sound Pressure Level: 103 dB (1 Vrms)
- Frequency Response: 6Hz - 48KHz
- Acoustic Principle: Closed-back
- Ear Cushion Material: Microfiber
What's in the box
- HD 820 headphones
- 3.0 m cable with 6.35 mm connector (unbalanced)
- 3.0 m cable with 4.4 mm connector (balanced)
- Documentations
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 we simply said, “listen”. The HD 820 combines an innovative glass reflector and ring radiator transducer technology for a benchmark listening experience.
Features
Here are the reasons why?
- Reference class closed-back audiophile headphones
- Closed-back earcups
- 56mm ring radiator transducers
- German craftsmanship
- Detachable cable
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, audiophile-grade sound meant open-back designs like Sennheiser’s—famous for surpassing even large hi-fi systems. The HD 820 changes that, delivering immersive detail and soundstage in a closed-back 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.
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 favorably impacts rest and response times.
Both inner and outer edges of the ring are secured to the drive unit, with the voice coil vibrating the diaphragm via a V-shaped groove near its center. A vibration-damping chassis and inert headband ensure stability, delivering precise, fast response across all frequencies. Each transducer is tightly tested for consistent, dependable performance.
Exhaustive engineering
The deep, almost magical stereo imaging of the HD 820 is the sum of the exhaustive engineering poured into it.
Developed in Germany and built in Ireland, the HD 820 pairs premium craftsmanship with exceptional sound. Its angled ring radiator driver reveals voices and instruments with striking realism, while plush ear padding and smart articulation ensure a perfect seal. Ideal for both critical and private listening, it keeps sound in—and distractions out.
An Ergonomic Treat
The HD 820 delivers on long-term wearing comfort too, providing a listening experience as plush as it is immersive.
Ultra-soft padding and lightweight composites minimize pressure, while dual-axis earcups adapt to your head for effortless comfort—letting you focus fully on hi-fidelity sound.
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.
Your HD 820 adapts to any setup with essential low-capacitance, impedance-matched cables. It includes a 6.3mm plug for standard hi-fi gear and a 4.4mm balanced connector for modern devices. An optional XLR-4 cable adds even more flexibility. Each 3m cable gives you freedom to listen comfortably, wherever your gear is.
More Information
What you need to know
Does the HD 820 have a closed-back design?
Yes, The HD 820 has a closed-back design and unique components to provide a spacious soundstage.
The sound of the HD 820 can be best described as ...
The HD 820 produces a natural spatial listening experience.
Which of these SOUND features does the HD 820 have?
- Sennheiser signature sound
- 56 mm Ring Radiator transducer
- 40 mm voice coil
- Acoustic absorber system
- Closed-back design
Which of these COMFORT features does the HD 820 have?
- Headband damping element
- Vibration dampening chassis
- Angled drivers
- Detachable cables
- Ultra-ergonomic design
Does the HD 820 have the option for a balanced cable?
Yes, A balanced cable with a 4.4 mm plug is included with the HD 820. A balanced cable with an XLR-4 plug is sold separately as an optional accessory.
Does the HD 820 feature acoustic absorber technology?
Yes, The HD 820 has an acoustic absorber system to reduce frequency masking and allow you to hear all the details and nuances of your music.
The HD 820 has an impedance of ...?
The HD 820 has an impedance of 300 Ω (Ohms) which ensures consistent performance.
Which of these CRAFTSMANSHIP features does the HD 820 have?
- German design & engineering
- Precision built in Ireland
- Premium materials
- Outstanding build quality
To connect to an audio source the HD 820 includes two detachable cables with what type of plugs?
With two (2) cables included (6.35 mm unbalanced and 4.4 mm balanced) you can connect the HD 820 to a multitude of audio devices.
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