Sennheiser HD 800 S

The HD 800 S is a pair of open-back headphones 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 achieved with loudspeakers, while maintaining a high level of detail.

The headphones are manufactured in Germany using materials employed in the aerospace industry. Each unit is assembled by hand and individually inspected. The HD 800 S stands out in particular for its matte black finish and the integration of a patented acoustic absorption system, designed to reduce certain resonances present in the previous model. It uses 56 mm drivers and an open-back architecture, with the aim of delivering accurate audio signal reproduction.

Ring Radiator technology: a revolutionary approach to the dynamic driver

At the heart of the HD 800 S lies a major innovation: the 56 mm diameter Ring Radiator driver. Unlike traditional dome-shaped diaphragms, this annular design features a diaphragm with a central opening. The diaphragm is secured both around its outer perimeter and along 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. Diaphragm rigidity is greatest at the voice coil, making it possible to harness the benefits of a large driver (significant air displacement) without suffering from unwanted deformation at high frequencies. The Duofol technology used for the diaphragm a multilayer film of varying thickness allows precise control of resonance modes and extends the frequency response up to 51 kHz.

Removing the center of the diaphragm also reduces the phase interference that traditionally affects large drivers. The result is more coherent sound wave propagation across the entire spectrum, contributing to the exceptional clarity and lack of coloration of the HD 800 S.

Design and ergonomics: comfort for long listening sessions

The HD 800 S adopts an unmistakable futuristic design. The large D-shaped ear cups naturally follow the shape of the outer ear, providing generous space that avoids any contact with the pinnae. This design, combined with a featherlight weight of 330 grams, allows extended listening sessions without fatigue.

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

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

Sound signature and acoustic characteristics

The HD 800 S features a sound signature that can be described as studio-reference: neutral with a slight emphasis on clarity and definition. Its soundstage is its greatest asset probably the widest and airiest available in dynamic headphones. The angled drivers create a three-dimensional presentation in which each instrument occupies a defined space, with remarkable separation between the different sound layers.

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

The bass range is the relative Achilles’ heel of the HD 800 S. Although linear down to around 100 Hz, it rolls off rapidly in the sub-bass. This characteristic, typical of the Sennheiser approach, prioritizes definition and speed over physical impact. Fans of electronic music or metal may find the presentation 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 cramped soundstage and anemic bass. The best results are achieved with amplifiers delivering at least 1W into 300 ohms.

The extremely revealing nature of the HD 800 S makes it an unforgiving tool that ruthlessly 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 pairings, with some amplifiers adding more warmth and body, and others emphasizing the analytical character.

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

HD 800 S accessories and maintenance

Sennheiser supplies the HD 800 S in an understated 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 generous length for fixed installations.

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

Maintenance is limited to periodically replacing the ear pads and headband padding for hygiene reasons. Original ear pads (part number 050635) cost around 70 euros, but many third-party alternatives in leather or other materials are available from 30 euros. Replacement is simple: the ear pads are removed by gently pulling them off and reattached by pressing around the entire perimeter.

Compatibility and technologies

The HD 800 S remains resolutely analog in an increasingly digital world. No wireless connectivity, no active noise cancellation, and no connected 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 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 lie.

Using parametric equalizers allows the sound signature to be tailored to personal preferences. Many equalization profiles created by the audiophile community are available to correct the slight bass attenuation 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