Stax SR-007S: Electrostatic Heritage and Acoustic Innovations
July 04, 2025
The world of electrostatic headphones remains a unique realm in high-end audio, where the pursuit of transparency and sonic fidelity takes precedence over all other considerations. With the SR-007S, Stax revisits one of its iconic models, incorporating technical advancements drawn from its historical expertise and cutting-edge technologies developed for its flagship, the SR-X9000.
Redesigned Electrostatic Unit: Precision and Balance
The SR-007S is built around a new electrostatic unit, the result of a complete overhaul of the diaphragms and fixed electrodes. This evolution aims to enhance detail clarity while preserving the depth and richness of the bass register, a signature of the 007 series. The large circular electrodes benefit from high-precision etching, with ventilation holes whose diameter has been reduced by 20% compared to previous generations. This technical choice optimizes airflow and refines sound reproduction, resulting in a wider soundstage and better instrument separation.
Electrostatic technology, which relies on moving an ultra-light polymer film suspended between two electrodes, achieves a fast transient response and a level of uniformity across the spectrum that is rarely matched. The absence of magnets eliminates distortions related to magnetic hysteresis, contributing to exceptionally pure sound reproduction.
Anti-Resonance Structure: Rigidity and Silence
Inspired by the SR-X9000, the SR-007S’s anti-resonance structure (ARS) features a one-piece stainless steel headband with no joints. This design aims to limit unwanted vibrations and reinforce overall rigidity—two essential factors for preserving the integrity of the audio signal. The movable section, equipped with hinges, improves fit and comfort, while the rubber headband attachment ensures secure support without adjustment, true to the spirit of the series.
Comfort and Ergonomics: Sheepskin Earpads
Listening comfort, often overlooked in highly technical headphones, receives special attention here. The earpads, made from sheepskin, offer superior softness and breathability, while also helping to manage sound reflections. Their pivoting design allows them to adapt to all head shapes, and the more absorbent inner section helps widen the soundstage and enhance the sense of space.
The choice of a brown finish, a nod to the vintage aesthetic of the 007 series, is complemented by an internal structure made from absorbing material for greater control of internal resonances.
Technical Specifications and Usage
The SR-007S features specifications that meet the demands of high-resolution audio:
Type: electrostatic push-pull, open
Frequency response: 6 Hz – 41 kHz
Impedance: 145 kΩ at 10 kHz
Capacitance: 110 pF (including cable)
Sensitivity: 101 dB / 100 V rms / 1 kHz
Bias voltage: 580 V DC
The now detachable cable structure makes maintenance easier and paves the way for future upgrades, including the use of high-end cables tailored to each user’s preferences.
Listening Experience: Uniformity and Transparency
Listening to the SR-007S is distinguished by remarkable uniformity across the entire spectrum, transparency that highlights even the slightest nuance, and controlled dynamics. The absence of unwanted resonances, made possible by the ARS structure and choice of materials, results in natural reproduction, free from coloration or bass overhang. The soundstage, wide and precise, promotes immersion and clarity of sonic layers—qualities sought after by discerning audiophiles.
To better understand our visitors and measure marketing effectiveness, we and our partners use cookies on your device. Some, technically necessary, are exempt from consent. You can accept those that require your agreement, refuse them by clicking "Refuse", or customize your choices via the settings screen.
You can modify or withdraw your consent at any time via the "Consent and cookies" link. Your choices will apply on our site for 12 months.
