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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.
At £890, this Sennheiser HD 820 is a fair deal, sitting just below the median of £911 from your ground-truth comparable GBP listings. It is not a bargain (which would require being under the 25th percentile of £688) but is certainly not ambitious, as it is well under the 75th percentile of £948. The price aligns solidly with the typical used market for this closed-back flagship, offering strong value without the risk of being overpriced.
The HD 820 is highly regarded for its closed-back design that delivers reference-class sound with the signature clarity of the HD 800 S, while the unique concave Gorilla Glass cups reduce external interference. Its 300Ω impedance and wide frequency response (6–48,000 Hz) ensure exceptional detail and dynamic range. With excellent condition and likely original accessories, this listing represents a genuine buying opportunity for enthusiasts seeking top-tier closed-back performance at a fair used price.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Founded in June 1945 by Dr. Fritz Sennheiser in a farmhouse near Hanover, Germany, Sennheiser began as Laboratorium Wennebostel, producing voltmeters and early microphones amid post-World War II reconstruction. Seven engineers from the University of Hannover joined the founder, quickly pivoting to broadcast microphones like the DM 2 in 1946 and the groundbreaking MD 82 shotgun mic in 1956. Renamed Sennheiser electronic in 1958, the family-owned company passed to second- and third-generation leadership, maintaining its innovative spirit over eight decades.
Sennheiser excels in professional and consumer audio, renowned for microphones, wireless systems, and headphones that set industry standards. Pioneers of the first open-back headphones (HD 414 in 1968) and enduring studio icons like the MD 421 and MD 441, they also produce high-end headphones, earbuds, soundbars, and conferencing solutions. While strong in pro audio like mixers and geophysical gear, their consumer focus centers on headphones and wireless tech rather than amplifiers, speakers, turntables, DACs, or cables.
Sennheiser commands a premium position in the hi-fi market, blending mid-tier accessibility with high-end excellence for discerning buyers and professionals. Trusted for reliability and sonic precision, it appeals to audiophiles seeking reference-grade headphones without boutique obscurity, backed by a heritage of technological firsts that sustains its global leadership.
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