Sennheiser HD 800 S

The HD 800 S is an open-back headphone developed by Sennheiser, succeeding the HD 800 launched in 2009. Designed for analytical listening and use in audio production environments, it incorporates technical choices aimed at reproducing a soundstage close to that of loudspeakers, while maintaining a high level of detail.

The headphone is manufactured in Germany from materials used in the aerospace industry. Each unit is hand-assembled and individually inspected. The HD 800 S stands out with its matte black finish and the integration of a patented acoustic absorption system, designed to attenuate certain resonances present in the previous model. It uses 56 mm transducers and an open architecture, with the goal of delivering precise audio signal reproduction.

Ring Radiator Technology: A Revolutionary Approach to Dynamic Drivers

At the heart of the HD 800 S lies a major innovation: the 56 mm Ring Radiator transducer. Unlike traditional dome-shaped diaphragms, this annular design features a membrane with a central opening. The diaphragm is attached both at its outer edge and at the inner edge of the ring, while the 40 mm voice coil is positioned in a V-shaped groove between these two anchor points.

This unique architecture offers several decisive advantages. The diaphragm’s rigidity is maximal at the voice coil, allowing the benefits of a large transducer (significant air displacement) without suffering from unwanted deformations at high frequencies. The Duofol technology used for the diaphragm—a multilayer film of variable thickness—enables precise control of resonance modes and extends the frequency response up to 51 kHz.

Eliminating the center of the diaphragm also reduces phase interference that traditionally affects large transducers. The result is a more coherent propagation of sound waves across the entire spectrum, contributing to the HD 800 S’s exceptional clarity and lack of coloration.

Design and Ergonomics: Comfort for Long Listening Sessions

The HD 800 S features a futuristic design that is instantly recognizable. The large D-shaped earcups naturally follow the shape of the outer ear, providing generous space that avoids any contact with the ear itself. This design, combined with a featherweight of 330 grams, allows for extended listening sessions without fatigue.

The high-quality microfiber ear pads are hand-assembled and feel soft against the skin. Their moderate thickness ensures optimal support without excessive pressure. The headband, made of multilayer plastic reinforced with an internal metal structure, combines lightness and strength. The adjustment system allows for precise adaptation to all head shapes.

The open structure uses an ultra-fine metal grille that protects the transducers while allowing optimal airflow. This grille, though sturdy, remains vulnerable to deformation and requires careful handling. The proprietary ODU dual-pin connectors ensure a reliable connection but require caution when changing cables, as the attachment system is held only by friction and two thin wires.

Sound Signature and Acoustic Characteristics

The HD 800 S is characterized by a sound signature that can be described as studio reference: neutral with a slight emphasis on clarity and definition. Its soundstage is its main asset—probably the widest and most spacious available on a dynamic headphone. The angled transducers create a three-dimensional presentation where each instrument occupies a defined space, with remarkable separation between different sound layers.

The integrated absorption technology, inherited from the IE 800 in-ear monitors, effectively eliminates the 6 kHz resonance peak that sometimes made the original HD 800 sound harsh. This improvement results in smoother, more natural highs, while preserving extraordinary resolution. Micro-details, reverberations, and instrumental textures are reproduced with surgical precision.

The bass register is the relative Achilles’ heel of the HD 800 S. Although linear down to about 100 Hz, it drops off quickly in the sub-bass. This characteristic, typical of Sennheiser’s approach, favors definition and speed over physical impact. Fans of electronic music or metal may find the sound lacking in body and authority in the low frequencies.

The Crucial Importance of the Amplification System

With an impedance of 300 ohms and a sensitivity of 102 dB/V, the HD 800 S absolutely requires a quality headphone amplifier to reveal its potential. An underpowered amplifier will result in a lack of dynamics, a narrow soundstage, and weak bass. The best results are achieved with amplifiers offering at least 1W at 300 ohms.

The extremely revealing character of the HD 800 S makes it a ruthless tool that mercilessly exposes weaknesses in the audio chain. The quality of the source, DAC, and amplifier directly influences the final sound. Users report significant differences depending on the pairing, with some amplifiers adding more warmth and body, others emphasizing the analytical character.

Using the supplied balanced cable (4.4 mm Pentaconn connector or 4-pin XLR depending on the version) with a compatible amplifier optimizes channel separation and reduces background noise. This configuration is particularly recommended for critical listening and studio work.

Accessories and Maintenance of the HD 800 S

Sennheiser delivers the HD 800 S in a simple yet functional presentation box. Two 3-meter cables are included: an unbalanced cable with a 6.35 mm jack connector and a balanced cable (4.4 mm Pentaconn on recent models, 4-pin XLR on earlier versions). The fabric-sheathed cables offer excellent build quality and a generous length for fixed installations.

A microfiber cloth and a USB key containing the digital certificate of authenticity complete the package. This USB key also contains the specific frequency response curve for your unit, individually measured at the factory—a rare touch that reflects the product’s premium positioning.

Maintenance is limited to periodic replacement of the ear pads and headband padding for hygiene reasons. The original ear pads (reference 050635) cost around 70 euros, but many third-party alternatives in leather or other materials are available from 30 euros. Replacement is simple: the pads are removed by gently pulling and reattached by pressing around the entire edge.

Compatibility and Technologies

The HD 800 S remains resolutely analog in an increasingly digital world. No wireless connectivity, no active noise cancellation, and no smart features. This purist approach targets audiophiles seeking absolute sound quality without compromise. Its high impedance makes it compatible with most headphone amplifiers on the market, including tube models that add a coloration appreciated by some users.

The official frequency response extends from 4 Hz to 51 kHz (-10 dB), with total harmonic distortion below 0.02% at 1 kHz. These exceptional specifications translate into remarkable transparency across the entire audible spectrum and beyond. The patented absorption technology maintains a linear response in the critical high frequencies where harmonics and subtle details reside.

Using parametric equalizers allows you to tailor the sound signature to personal preferences. Many EQ profiles created by the audiophile community are available to correct the slight bass roll-off or further soften the treble according to taste.

Technical Specifications

Acoustic Specifications

• Transducer type: 56 mm dynamic ring radiator
• Design: open-back circumaural
• Frequency response: 4 Hz – 51,000 Hz (-10 dB)
• Impedance: 300 Ω
• Sound pressure level: 102 dB (1 V)
• Total harmonic distortion: 0.02% (1 kHz, 1 V RMS)
• Voice coil: 40 mm for outstanding audio clarity
• Exclusive acoustic absorption system to reduce frequency masking
• Ultra-wide soundstage for total immersion in the recording environment

Design and Construction

• German design, precision-assembled in Ireland
• Adjustable metal headband with dual-axis swiveling earcups
• Vibration-damping chassis with inert insert for maximum stability
• Premium microfiber ear pads for long-lasting comfort
• Matte black metal components for a sleek, modern look
• Clamping force: 3.4 N (± 0.3 N)
• Weight without cable: 330 g

Connectivity and Cables

• Detachable cables with gold-plated connectors
• Main connector: 6.35 mm jack
• Balanced connector: 4.4 mm jack
• Cable length: 3 m

Box Contents

• HD 800 S headphones
• Cable with 6.35 mm jack connector
• Cable with 4.4 mm jack connector (balanced)
• Microfiber cleaning cloth
• User manual

General Information

• Wearing style: headband
• Ear coupling: circumaural
• Color: black
• Iconic Sennheiser sound, natural and spacious, with minimal resonance