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Stax is a high-end Japanese audio brand that specialises in electrostatic headphones. Stax being the shortened form of ‘electrostatic’. Founded in 1938, it has a long history of innovation. They’re known for their detailed & accurate sound reproduction…and for creating the best headphones in the world.

Read our feature on Stax & Electrostatic Earspeakers

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Stax’s commitment to absolute audio perfection, coupled with Japanese culture's dedication to craftsmanship, hard work & authenticity, has gained them fanatical customers.

Electrostatic Headphones

The Stax SR-X9000 are a high-end electrostatic headphone known for their transparent, natural & detailed sound. They feature a new four-layer fixed electrode design that delivers a wider soundstage and improved bass response. The headphones also have a wide frequency response of 5Hz to 42kHz, making them capable of reproducing a wide range of sounds.

Category Open-Back Headphones
Country Japan
Manufacturer Stax

  • STAX SR-X9000

    SR-X9000 is the new flagship Earspeaker that marks the pinnacle of Stax electrostatic headphones production. A major technology advancement is the “MILER-3” (Multi-Layer-Elect-Rords) - a four-layer fixed electrode that combines mesh electrodes and conventional etching electrodes, crimped by thermal diffusion bonding. The newly developed manufacturing technique matures through a 20-year accumulated research and development, allowing a rigid structure that is resistant to resonation while smoothly evolving the transmission characteristics of sound compared to conventional multilayer fixed electrodes.

  • Type:
    push-pull electrostatic sound element, open-air type enclosure

    Sound element shape:
    large round shape 

    Fixed electrode:
    MLER-3 (Multi-Layer Electrodes)

    Frequency response:
    5 - 42,000Hz

    Electrostatic capacitance:
    110pF  

    Impedance:
    145kΩ  

    Sound pressure sensitivity:
    100dB 

    Bias voltage:
    580V DC

    Attached cable conductor:
    6N(99.9999%)OFC + silver plated annealed copper wire

    Cable:
    parallel 6-strand, low-capacity wide cable

    Cable length:
    2.5m,1.5m

    Ear pad:
    genuine sheep leather (skin touching portion), artificial leather (surrounding portion)

    Weight:
    432g (ear speaker)


The Ultimate Head-Fi System handcrafted in Japan

The Stax SR-9000 Electrostatic Headphones have unique electrostatic drivers with featherweight diaphragms that move incredibly fast. Combined with the SRM-T8000 Vacuum Tube Energiser, you’ll hear layers of detail that regular headphones can't touch.