Sennheiser HD820 | Closed-Back Dynamic Headphones
Sennheiser HD820 is wide open sound in a closed-back headphone
- Closed-back, Dynamic, Over-ear Headphones
- Sennheiser HD800 performance in a closed back headphone
- Unique engineering to manage reflections and preserve a cohesive sound in a closed-back headphone.
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.
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.
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 800S. While also a striking visual feature, the technical execution of the glass reflector yields a sound stage never before experienced in a sealed headphone.
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.
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 center of the ring. The headphone’s 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 HD 820 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.
Reference class open-back audiophile headphones
56mm ring radiator transducers
56mm Ring Radiator dynamic transducer system
Concave Gorilla Glass reflectors deliver impressive spatial sound reproduction
Acoustic absorber system prevents frequency masking for unheralded detail
Ultra-ergonomic adjustable metal headband with inner damping element
Luxuriously comfortable microfiber ear and headband padding on key contact points
Developed in Germany and precision-built at Sennheiser’s state-of-the-art Ireland plant
The deep, almost magical stereo imaging of the HD 820 is the sum of the exhaustive engineering poured into it.
Developed in Germany and crafted at our state-of-the-art Ireland plant, its fit and finish is second only to its sound quality. When combined with the ring radiator’s superlative response, the driver’s angle allows you to locate voices, instruments, and their inherent environments. The sound field expertly balances realism and escapism, transporting you to the heart of your favorite recordings and nowhere else. The luxurious ear padding and progressive articulation points form a satisfying seal, eliminating distractions for added focus during extended listening sessions. For critical listening tasks and private listening alike, the HD 820 prevents unwanted sound from coming in or bleeding out.
Impedance: 300 ohms
Frequency Response: 6 - 48,000 Hz (-10 dB)
Total harmonic distortion: 0.02 % (1 kHz 1 Vrms)
Frequency response (speaker): 6 Hz - 48,000 Hz
Sound pressure level (SPL): 103 dB (1 V)
Impedance: 300 Ω
Total harmonic distortion (THD): < 0.02% (1 kHz, 100 dB)
Cable length: 3 m
Adapter: XLR-4, balanced, 4-pin Stereo jack plug: 1/4" (6.35 mm), unbalanced, 3-pin 4.4 mm, balanced, 5-pin
Transducer principle: dynamic, open
Weight: 360 g
Connector: XLR-4, balanced, 4-pin Stereo jack plug: 1/4" (6.35 mm), unbalanced, 3-pin 4.4 mm, balanced, 5-pin
Ear coupling: circumaural
Magnetic field: 10.5 mT