Stax SR-009S


  • Multi-Layer-Elect-Rords
  • Aluminum Enclosure
  • High-purity copper cable
  • Push-Pull Open Back Circular Electrostatic Headphone
  • Real leather Earpad
  • 10-step slider ARC head band

Available on backorder


Multilayer fixed electrode MLER (Multi-Layer-Elect-Rords) established with SR-009 has evolved to MLER 2. The finish and etching process that smoothes the edge of the electrode opening reduces air resistance while further improves sound permeability. Also, minimize the resonance of the ultra-thin electrode with the gold plated electrodes with high specific gravity. At the same time, due to the effect of reducing the electric resistance of the electrode itself by gold plating, we have also opened up a new ground for high speed, clarity, silky details, and powerful texture.


SR-009S adopts a diaphragm made of ultra-thin super engineering plastic film. The light mass has realized a high transient characteristic throughout the entire audio spectrum. The redesigned main body further reduced resonance as to provide a consistent sound.


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.


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.

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.


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.
Specifications SR-009S
Type Push-Pull Open Back Circular Electrostatic Headphone
Frequency Response 5 – 42,000Hz
Electrostatic Capacitance 110pF (including cable)
Impedance 145k Ω (including cable, at 10kHz)
Sound Pressure Sensitivity 101dB / 100V r.m.s. 1 kHz
Maximum Sound Pressure 118dB / 400Hz
Bias Voltage 580V DC
Left & Right Identification “L” and “R” indicated on the arc assembly (inside head spring) Left channel cable is marked with a solid Line. Right channel is marked with a dotted Line.
Ear Pads Genuine Lamb Leather (direct skin contact), high-quality synthetic leather (surrounding portion)
Cable Silver-coated 6N (99.9999%) OFC parallel 6-strand, low-capacity special wide cable, 2.5m full length
Weight 1lb without cable / 1.3lb with cable
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