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The SR-009 is a memorable model that appeared in 2011 and became the foundation of the present STAX flagship Earspeaker development. At that time this extraordinary Earspeaker attained a big success as the model that materialized the idea that has been embraced by STAX developers in pursuit of further improvement of sound quality. The memorable model that has achieved the highest peak sound of the STAX present new flagship SR-009S will soon be followed by the SR-009BK as the 80th anniversary limited model in special black color version. The SR-009BK in black finish is the limited production of 180 units in the whole world.

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Multi-layer fixed electrode (MLER)

The fixed electrode that drives the whole diaphragm surface consists of three metal sheets unified through precision photograph etching processing on an atomic level using heat diffusion joint technology, which greatly improved the desirable electrode specifications such as planarity, low resonance and high sound wave permeability.

Tough machined aluminum chassis

Most part of the chassis is manufactured by precise machining to attain high-quality sound, rigidity and lightweight solution. The SR-009BK newly creates a sophisticated appearance along with the alumite-treated black color of the 80th anniversary special version.

Notation of 80th anniversary

Anniversary model notation is printed at cable attachment part.



push-pull electrostatic large circular sound element,
open-air type enclosure

Frequency response

5 - 42,000Hz

Electrostatic capacitance

110pF (including cable)


145kΩ (including cable, at 10kHz)

Sound pressure sensitivity

101dB / input 100Vr.m.s. / 1kHz

Bias voltage



596g (including cable), 454g (without cable)


Genuine sheep leather (skin touching portion), high-quality artificial leather (surrounding portion)


Silver-coated 6N (99.9999%) OFC parallel 6-strand, low-capacity special wide cable, 2.5m full length


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