Stax SR-009D

The STAX SR-009D is a legendary electrostatic headphone reborn, bringing one of the most influential designs in high-end audio back to life. As the foundation of STAX’s modern flagship models, it combines proven engineering with subtle refinements. As a result, it delivers a level of transparency, speed, and detail that defines true reference listening.

A classic returns, refined

Originally introduced as a benchmark in electrostatic design, the SR-009 quickly became a reference for audiophiles worldwide. Now, the SR-009D returns in response to continued demand, featuring updated materials and a refreshed finish. While its core performance remains unchanged, these refinements improve usability and make this iconic model more accessible than before.

MLER technology for ultimate precision

At the heart of the SR-009D lies STAX’s Multi-Layer Electrode (MLER) technology. This advanced structure uses thermally bonded metal layers, fused at an atomic level under vacuum conditions. Consequently, the electrodes achieve exceptional flatness and low resonance, allowing sound waves to pass with minimal interference. The result is a presentation that feels incredibly fast, clean, and precise.

Electrostatic performance without compromise

The large circular sound unit ensures even energy distribution across the diaphragm. Therefore, the SR-009D reproduces music with outstanding resolution and a natural sense of space. Subtle details emerge effortlessly, while dynamics remain controlled and lifelike, even in complex recordings.

Improved usability with detachable cable

The SR-009D introduces a replaceable cable system, now standard across the STAX range. This design allows easy maintenance and opens the door to future cable upgrades. As a result, the headphone becomes more practical for long-term ownership without compromising performance.

Built on a legacy of innovation

As the model that inspired both the SR-009S and the flagship SR-X9000, the SR-009D holds a unique place in STAX history. It offers a direct connection to the brand’s most important innovations while maintaining a timeless approach to sound reproduction.

Key highlights

• Reference electrostatic headphone from STAX
• MLER (Multi-Layer Electrode) technology for ultra-low distortion
• Large circular sound unit for wide and natural soundstage
• Exceptional speed, detail, and transparency
• Updated finish and materials for improved usability
• Detachable cable design for easy maintenance and upgrades
• Direct heritage from SR-009, SR-009S, and SR-X9000

A true electrostatic reference

By combining groundbreaking electrode design with timeless engineering, the STAX SR-009D delivers a listening experience that remains unmatched in its class. Ultimately, it offers pure insight into the music—fast, open, and effortlessly revealing every nuance of the recording.