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 combining mesh electrodes and conventional etching electrodes that are 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.

STAX SR-X9000 Electrostatic Headphones Top View

A product development story: the circular metal mesh once mounted on the SR-X was one of the ideal electrodes to reduce the effects of air resistance and reflections and increase sound permeability. However, there was a big hurdle in installing metal mesh electrodes in products because they lack strength and are resonant-prone that causes playback sound to become muddy. In the 1990s, the original SR-Ω was developed with the goal of increasing the size of the metal mesh; however, the manufacturing technique was at its infancy as it was unpractical to produce stable products. As a matter of fact, there was only a few pairs of SR-Ω were made.

STAX SR-X9000 Electrostatic Headphones Earpads

The SR-X9000 diaphragm is made of ultra-thin engineering film that is 20% larger than the previous flagship SR-009S. The diaphragm mass has been reduced to create a lightning-fast reaction speed and high-frequency response range that elevates headphone listening to a whole new level.

ENCLOSURE:
Aluminum is a metal good for sound and suitable material for audio equipment. It is abundantly used, e.g. at the frame supporting the appearance and sound element, to realize high-quality sound, rigidity and lightweight. Almost every part of the SR-009 is manufactured through precise machine processing.

STAX SR-X9000 Electrostatic Headphones Enclosure

CABLE:
The high-purity copper developed from the necessity of wiring large-scale integration circuits is also known as high-quality audio cables. High-purity copper wire of 99.9999% (6Nines) purity adopted for the cable is further silver-coated and finished with the most suitable structure to drive the earspeaker.

STAX SR-X9000 Electrostatic Headphones Cable

EARPAD:
The earpad of a new design is carefully made by a craftsman's hand and features both the real leather with good humidity environment and the cushion material with moderate elasticity.

The new earpad enables hours of comfortable listening to music.

STAX SR-X9000 Electrostatic Headphones Earpads

ARC (head band):
The arc is equipped with a position adjustment mechanism of 10-step slider and corresponds to the wide range of cranial form with individual difference.

STAX SR-X9000 Electrostatic Headphones Headband

Specifications:

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)

In the box

STAX SR-X9000 headphone x 1
Storage box x 1
Owners manual x 1