The Sennheiser HD-820 Reference Closed Headphones deliver an expansive, wide-open soundstage for critical music listeners seeking acoustic isolation in an over-ear design. By combining specialized acoustic chambers with large-format dynamic drivers, these headphones eliminate the closed-in, boxy sound typical of traditional sealed enclosures while shielding you from external distractions.Expansive Spatial Clarity via Concave Glass Reflectors:Sealed headphones often capture standing sound waves that cloud musical clarity. Sennheiser resolves this by fitting concave Gorilla Glass covers over each driver. These precision reflectors bounce rearward audio energy straight into dedicated internal absorber chambers, banishing unwanted resonances and opening up the stereo image. The result is a transparent, three-dimensional presentation that rivals open-back designs.Vivid Dynamics with Large 56mm Ring Radiators:At the core of the design sits a 56mm Ring Radiator transducer capable of moving substantial air volume while maintaining total diaphragm stability. This configuration provides effortless bass control, vivid midrange presence, and extended high frequencies without distortion. Every musical passage emerges with tight transient response and natural timing across the full audible spectrum.All-Day Comfort with Acoustic Isolation:Crafted for hours of fatigue-free listening, the headband integrates a layered damping element to suppress mechanical vibrations along the frame. Thick, handcrafted earpads wrapped in soft microfiber and synthetic leather form a snug acoustic seal around your ears, isolating ambient room noise while preventing your audio from leaking into quiet spaces.Authorized Dealer:We are an authorized dealer for Sennheiser, ensuring you receive authentic gear backed by direct factory assistance and knowledgeable product guidance. Purchasing from a trusted brand partner gives you complete peace of mind, with full manufacturer warranty coverage supporting your personal listening journey.Key Features and Benefits: Concave Gorilla Glass Reflectors: Directs rear sound waves into internal absorbers to deliver an expansive, natural soundstage without boxy resonances. 56mm Dynamic Ring Radiator Transducers: Provides impactful, controlled bass and precise high-frequency detail across complex tracks. Handcrafted Microfiber Earpads: Creates a comfortable seal that blocks ambient noise while keeping your music private. Damped Metal Headband: Minimizes mechanical resonance across the frame for smooth, uninterrupted listening sessions. Detachable Audiophile Cables: Includes dedicated balanced and unbalanced connections featuring silver-plated oxygen-free copper wiring for clean signal transfer. Technical Specifications: Transducer Principle: Dynamic, closed-back ring radiator transducer Transducer Size: 56 mm Frequency Response: 6 Hz – 48,000 Hz (-10 dB) / 12 Hz – 43,800 Hz (-3 dB) Impedance: 300 ohms Sound Pressure Level (SPL): 103 dB at 1 kHz, 1V Total Harmonic Distortion (THD): < 0.02% (1 kHz, 1 Vrms) Ear Coupling: Circumaural (Over-Ear) Contact Materials: Microfiber fabric, synthetic leather, Gorilla Glass Cable Connections: 6.35 mm unbalanced stereo jack, 4.4 mm Pentaconn balanced plug Weight: Approximately 360 g (without cable)
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