STAX SR-009 Electrostatic Flagship Headphone still one of the best headphone in the summit-fi market, the gold standard of highend headphone which inspire Abyss to create the 1266 family and was used as references on the making of Senns HE-1. Here is my pair of STAX SR009 bought in DYNAMIC AUDIO 5555 in Akihabara, Tokyo. They will be responsible for international repair as well.

I used it about only a few times in a years, only on weekends as i am very busy weekdays working, The remaining time I mostly use my Focal Utopia as my daily go to headphone.

Most of its time this SR009 is store within its original Box with dehumidifier on, No Pet & No Smoking Hifi room with my electrostatic loud speakers.

The newer SR-009S version have a different tuning although not a day and night different, many like myself does perfer the 009 treble energy and extension compare to the 009S. But SR009S is slighty warmer.
I personal prefer the 009 to the 009S because there is a hole in the 009S bass response in order to increse warmth, not to mention later production 009 with Serial# SZ9-4xxx have similar treble response as 009S and 009BK.

The inner-diagram is also very clean.



Original named the C32 it was tended as a techlogy demostrator protorype which they bring to headphoe show to show case what they have accomplish, although never planned to be mass-produce, this groudbrakering headphone soon recieve reputation being the best in the world and bring STAX to a whole new stage of its history.


↑The interesting STAX C32 prototype story from Fujiya Avic youtube channel, please kindly use youtube auto-translation English subtitle if you do not understandthe launage.↑

I remember these headphone came in so limited supply where even in Tokyo it was so hard to find one in stock atleast until 2014-15 when Edifer`s capatle start kicking in.

Description (Headamp, 2021)
The newly developed sound element has been adopted in the SR-009. New high polymer ultra-thin film material called the super engineering plastics – the reinforced material of the conventional engineering plastics – is employed for the diaphragm of the sound element. Materials superior especially in tone quality have been selected to attain the extremely excellent frequency characteristic from low to super-high as well as the vast dynamic range.

New electrodes named MLER (Multi Layer ElectRodes) have also been developed to realize the plane drive of the whole film diaphragm surface. While infinite thinness and flatness are required for the fixed electrodes, they simultaneously need to have other characteristics such as low resonance, high transmissivity of sound wave, and so on. The entirely new electrodes have been completed through the unification of metal plates processed with ultra-precision photograph etching using the high technology of heat diffusion combination on the atomic level.

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.

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.
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.

Specifications
● Type: push-pull electrostatic circular sound element, open-air type enclosure
● Frequency response: 5 – 42,000Hz
● Electrostatic capacitance: 110pF (including cable)
● Impedance: 145kΩ (including cable, at 10kHz)
● Sound pressure sensitivity: 101dB / input 100Vr.m.s. / 1kHz
● Maximum sound pressure level: 118dB / 400Hz
● Bias voltage: 580V DC
● Right/left channel indication: ’L’ and ‘R’ indicated on the arc assembly (inside head spring), solid line (left) and dotted line (right) on the cable
● Earpad: real 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 full length
● Weight: 596g (including cable), 454g (without cable)

(New MSRP for the STAX SR009 in 2021 is still 3825USD)
*It used to be 5250USD when launch.
Now this pair of Like New only ask for
2500USD + Shipping + PayPal Fee
NO TRADE PLEASE!!
Worldwide shipping with EMS (tracking provided)
(Slight offer are welcome but NO SILLY OFFER PLEASE)
**Come with Outer Box, Inner wooden box, SR009 Headphone, userguide & Warrently Card


Second hand fair condition 009 are selling for 2200-2300USD in yahoo japan auction, so my like new is 300USD more expensive which I think is reasonable.


Please see my other post for my coming SR007MK1 listing. (Now SOLD)

**I am selling this to fund myself to buy new STAX SR-X9000