Stax SR-X9000


  • Evolution to “MLER-3”
  • Round shaped metal-mesh
  • Diaphragm is made of ultra-thin super engineering plastic film
  • Enclosure made of tough machined aluminum eliminates unnecessary vibrations
  • Tilt guard mesh design
  • Stainless-steel arc assembly with 9 steps adjusting click system
  • Comfortably fitting genuine leather ear pads
  • Replaceable cables

Available on backorder



The history of X – THE Ω HERITAGE

What is the ideal electrostatic earspeakers? A fixed electrode which reduces air resistance and the effect of reflection. This electrode also has the high sound transparency. This vision was already found in the metal-mesh electrode of SR-X, which was released in 1970. After that, STAX challenged to realize metal-mesh electrodes for SR-Ω in 90’s again. However, the big metal-mesh electrode was difficult to manufacture. So, the mass production was extremely difficult. This is why SR-Ω was produced in small quantities even though this product has high quality sound.

Evolution to “MLER-3”

20 years have passed since SR-Ω was released. In the meantime, the manufacturing technology of metal-mesh was improved. And through the development of SR-009, the know-how of manufacturing multi-layer fixed electrodes evolved. These factors realized the new flagship “SR-X9000”. “MLER-2”, which was installd in SR-009S, evolved into the four-layer “MLER-3”. An etching electrode and a metal-mesh electrode are bonded using the diffused junction (thermocompression bonding). After 2 generations of STAX flagship models, STAX’s manufacturing technology makes a significant contribution to the stable mass production of big round shaped metal-mesh electrodes. For MLER-3, sound transparency evolved more smoothly than conventional multi-layer fixed electrodes. And the rigidity characteristic resistant to vibration also evolved.

Passion for metal-mesh

SR-X has a round shaped metal-mesh installed to reduce air resistance and the effect of reflection. This increased the sound transparency. So, metal-mesh is the ideal material of fixed electrodes. However, bigger and thinner metal mesh electrodes are poor in rigidity and may make sound unclear. This is the reason why it was too hard to install metal mesh electrodes in STAX products. In 1990s, SR-Ω, in which the metal mesh electrode is installed was developed. Because the metal mesh electrode was made bigger for this model, it had to be reinforced with an adhesive by hand. This is a very high precision work. So, it was extremely difficult to manufacture metal mesh electrodes for SR-Ω. The stable mass production could not be realized. This is the reason why SR-Ω was sold in very small quantities in spite of its high sound quality.

The diaphragm increases 20% in size compared with the previous flagship model

The diaphragm is made of ultra-thin super engineering plastic film. Due to weight saving close to zero, great transient characteristic is realized. From the base to the high range, the linearity of the sound is improved. The area of the diaphragm increases by 20% compared with SR-009S. This breakthrough realizes the widest sound field ever.

The enclosure which is made of tough machined aluminum eliminates unnecessary vibrations

The enclosure of the sound unit is made of tough machined aluminum. This new design firmly fixes the sound unit and completely eliminates unnecessary vibrations. The sound wave from the unit flows more smoothly. The acoustic characteristic inside the enclosure is improved to realize clearer sound unaffected by sound reflection.
Specfications STAX SR-X9000
Type push-pull electrostatic large circular sound element, open-air type enclosure
Electrode MLER-3
Frequency response 5 – 42,000Hz
Electrostatic capacitance 110pF (including cable)
Impedance 145kΩ (including cable, at 10kHz)
Sound pressure sensitivity 100dB / input 100Vr.m.s. / 1kHz
Bias voltage DC580V
Right/left channel indication Golden solid line (left) and dotted line (right) on the cable
Earpad Genuine leather (skin touching portion), high-quality artificial leather (surrounding portion)
Cable Silver-coated 6N (99.9999%) OFC parallel 6-strand, low-capacity special wide cable, 2.5m、1.5m
Weight 432g (without cable)
Similar Product SR-009S
Weight 1 kg
Dimensions 25 × 25 × 10 cm


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