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Stax SR-009

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Euro 1.700,00

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Description

Description Freakuence!
The Stax SR-009 sounds as if you’re sitting right in the middle of a concert hall. The high frequencies are exceptionally airy, crystal-clear, and seem to float apart from their foundation, while the mids sit strikingly loosely in the mix. And these headphones really deliver on the bass!
Details
We’ve equipped it with brand-new, original ear pads and a headband! This is worth 538.00.
General description
The Stax SR-009 is a high-end electrostatic headphone renowned among audiophiles for its unmatched sound quality. The Stax SR-009 delivers a pure sound with a wide stereo image in which every detail is audible. Thanks to its open-back design, the soundstage extends beyond the physically audible space, with dynamics that sound natural and a reproduction of microdetails that offers subtle nuance. These headphones are ideal for anyone looking for headphones with character, but who also wants to experience purity in every aspect of sound quality.
The Stax SR-009 offers a sound balance in which the bass is solid without being overpowering, the mids are clear, and the upper mids are sparkling. The dynamics are impressive, with a responsiveness that convincingly renders both soft passages and intense crescendos. With these headphones, you’ll experience detail in the vocals, resonance in the instruments, and an open soundstage that draws you into the recording space. The sound remains natural, with no audible compression or distortion—a top-tier headphone for audiophiles and lovers of refined listening experiences.
Would you like to try out the Stax SR-009 for yourself in a listening room, compare it with other headphones, or discuss a possible trade-in? Contact us to schedule a listening session or explore comparison options; you’ll only truly discover the perfect match when you listen.
Stax SR-009 Specifications
Type: Push-pull electrostatic open-back circular sound element, open-air enclosure Frequency response: 5–42,000 Hz Electrostatic capacitance: 110 pF (including cable) Impedance: 145 kΩ (including cable, measured at 10 kHz) Sensitivity: 101 dB per 100 V r.m.s. at 1 kHz Maximum sound pressure level: 118 dB at 400 Hz Bias voltage: 580 V DC Cable: Parallel 6-strand silver-coated 6N OFC low-capacitance wide cable, length 2.5 m Ear pads: Genuine sheepskin leather for the parts that touch the skin; high-quality synthetic leather for the surrounding attachment areas Weight: Approximately 596 g including cable; approximately 454 g without cable
Background information
The Stax SR-009 is a state-of-the-art electrostatic headphone, designed by the renowned Japanese team at Stax. Its development focuses on unmatched sound quality and precision. The headphones utilize ultra-thin diaphragms and precision-engineered electrodes, known as “MLER” (Multi-Layer Electrode) technology. The materials have been carefully selected for optimal sound reproduction. The housing is made of aluminum for durability and to reduce resonance. Each pair is hand-assembled in Japan, adhering to the highest manufacturing standards.
Brand history
STAX Ltd. was founded in 1938 in Japan as a manufacturer of electrical components. In 1959, STAX introduced the world’s first electrostatic headphones, the SR-1. Since then, the brand has specialized in the production of electrostatic headphones and associated amplifiers, known as “earspeakers” and “driver units.” STAX developed the Lambda series in 1979, which introduced a new design with a larger ear cup and improved wearing comfort. In 2011, STAX became a subsidiary of Edifier Group. STAX’s products are handmade in Japan. The technology of STAX ear speakers is based on electrostatic drive, where ultra-thin diaphragms are driven between two electrodes. STAX offers several models ranging from entry-level to reference products. In addition to headphones and amplifiers, STAX also produces accessories such as cables and headrests. The name “STAX” is derived from the English word “stacks,” referring to stacked sound waves.

Additional information

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Questions & Answers

What is the frequency response of the SR-009?

The SR-009 has a frequency range of approximately 5 Hz to 42,000 Hz.

What should the bias voltage be for the SR-009?

The required bias voltage is 580 V DC.

What is the impedance of the SR-009, and what does that mean for the amplifier?

The impedance is 145 kΩ at 10 kHz, which means that only electrostatic amplifiers with sufficient output voltage can drive the SR-009 properly.

How should the cable connection and the left and right channels be identified?

Left and right are marked on the arch: the left side has a solid line on the cable, and the right side has a dotted line.

What type of amplifier or driver unit is compatible with the SR-009?

The SR-009 is intended solely for use with STAX electrostatic driver units (pro bias, 5-pin) and cannot be used safely with standard dynamic headphone amplifiers.

What about the sensitivity of the SR-009, and how loud will they sound?

The sound pressure sensitivity is 101 dB at 100 V rms input at 1 kHz, which means that a high voltage is required to achieve a significant volume.

Is it possible to replace the cable or ear cushions yourself?

The cable is made of high-quality OFC and is included with the product; replacing the cable or ear cushions usually requires service from the manufacturer or an authorized repair technician.

What is the lifespan or warranty for the SR-009?

Stax offers replacement parts for ear pads, cables, and other components; warranty and repair terms apply only when official STAX parts are used.

How much does the SR-009 weigh, and how comfortable is it during extended use?

With the cable attached, the SR-009 weighs approximately 594–596 grams; without the cable, it weighs about 450–454 grams, which makes it durable but noticeably heavy to use.

What is MLER technology, and how does the SR-009D differ from it?

MLER stands for “Multi-Layer Electrode”; in the SR-009D, the fixed electrode design has been updated to reduce resonance and improve high-frequency transmission.
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All about | Stax SR-009

Description Freakuence! | Stax SR-009

The Stax SR-009 sounds as if you’re sitting right in the middle of a concert hall. The high frequencies are exceptionally airy, crystal-clear, and seem to float apart from their foundation, while the mids sit strikingly loosely in the mix. And these headphones really deliver on the bass!

Details | Stax SR-009

We've equipped it with brand-new, original ear pads and a headband! This is worth 538.00.

General description | Stax SR-009

The Stax SR-009 is a high-end electrostatic headphone renowned among audiophiles for its unmatched sound quality. The Stax SR-009 delivers a pure sound with a wide stereo image in which every detail is audible. Thanks to its open-back design, the soundstage extends beyond the physically audible space, with dynamics that sound natural and a reproduction of microdetails that offers subtle nuance. These headphones are ideal for anyone looking for headphones with character, but who also wants to experience purity in every aspect of sound quality.
The Stax SR-009 offers a sound balance in which the bass is solid without being overpowering, the mids are clear, and the upper mids are sparkling. The dynamics are impressive, with a responsiveness that convincingly renders both soft passages and intense crescendos. With these headphones, you’ll experience detail in the vocals, resonance in the instruments, and an open soundstage that draws you into the recording space. The sound remains natural, with no audible compression or distortion—a top-tier headphone for audiophiles and lovers of refined listening experiences.
Would you like to try out the Stax SR-009 for yourself in a listening room, compare it with other headphones, or discuss a possible trade-in? Contact us to schedule a listening session or explore comparison options; you’ll only truly discover the perfect match when you listen.

Stax SR-009 Specifications | Stax SR-009

Type: Push-pull electrostatic open-back circular sound element, open-air enclosure Frequency response: 5–42,000 Hz Electrostatic capacitance: 110 pF (including cable) Impedance: 145 kΩ (including cable, measured at 10 kHz) Sensitivity: 101 dB per 100 V r.m.s. at 1 kHz Maximum sound pressure level: 118 dB at 400 Hz Bias voltage: 580 V DC Cable: Parallel 6-strand silver-coated 6N OFC low-capacitance wide cable, length 2.5 m Ear pads: Genuine sheepskin leather for the parts that touch the skin; high-quality synthetic leather for the surrounding attachment areas Weight: Approximately 596 g including cable; approximately 454 g without cable

Background information | Stax SR-009

The Stax SR-009 is a state-of-the-art electrostatic headphone, designed by the renowned Japanese team at Stax. Its development focuses on unmatched sound quality and precision. The headphones utilize ultra-thin diaphragms and precision-engineered electrodes, known as “MLER” (Multi-Layer Electrode) technology. The materials have been carefully selected for optimal sound reproduction. The housing is made of aluminum for durability and to reduce resonance. Each pair is hand-assembled in Japan, adhering to the highest manufacturing standards.

Brand history | Stax SR-009

STAX Ltd. was founded in 1938 in Japan as a manufacturer of electrical components. In 1959, STAX introduced the world's first electrostatic headphones, the SR-1. Since then, the brand has specialized in the production of electrostatic headphones and associated amplifiers, known as "earspeakers" and "driver units." STAX developed the Lambda series in 1979, which introduced a new design with a larger ear cup and improved wearing comfort. In 2011, STAX became a subsidiary of Edifier Group. STAX's products are handmade in Japan. The technology of STAX ear speakers is based on electrostatic drive, where ultra-thin diaphragms are driven between two electrodes. STAX offers several models ranging from entry-level to reference products. In addition to headphones and amplifiers, STAX also produces accessories such as cables and headrests. The name "STAX" is derived from the English word "stacks," referring to stacked sound waves.

Questions & Answers | Stax SR-009

What is the frequency response of the SR-009?


The SR-009 has a frequency range of approximately 5 Hz to 42,000 Hz.

What should the bias voltage be for the SR-009?


The required bias voltage is 580 V DC.

What is the impedance of the SR-009, and what does that mean for the amplifier?


The impedance is 145 kΩ at 10 kHz, which means that only electrostatic amplifiers with sufficient output voltage can drive the SR-009 properly.

How should the cable connection and the left and right channels be identified?


Left and right are marked on the arch: the left side has a solid line on the cable, and the right side has a dotted line.

What type of amplifier or driver unit is compatible with the SR-009?


The SR-009 is intended solely for use with STAX electrostatic driver units (pro bias, 5-pin) and cannot be used safely with standard dynamic headphone amplifiers.

What about the sensitivity of the SR-009, and how loud will they sound?


The sound pressure sensitivity is 101 dB at 100 V rms input at 1 kHz, which means that a high voltage is required to achieve a significant volume.

Is it possible to replace the cable or ear cushions yourself?


The cable is made of high-quality OFC and is included with the product; replacing the cable or ear cushions usually requires service from the manufacturer or an authorized repair technician.

What is the lifespan or warranty for the SR-009?


Stax offers replacement parts for ear pads, cables, and other components; warranty and repair terms apply only when official STAX parts are used.

How much does the SR-009 weigh, and how comfortable is it during extended use?


With the cable attached, the SR-009 weighs approximately 594–596 grams; without the cable, it weighs about 450–454 grams, which makes it durable but noticeably heavy to use.

What is MLER technology, and how does the SR-009D differ from it?


MLER stands for “Multi-Layer Electrode”; in the SR-009D, the fixed electrode design has been updated to reduce resonance and improve high-frequency transmission.

Reviews & awards | Stax SR-009

Stereophile – Comparing World-Class Headphones: Stax SR-009

: Here, the SR-009 is praised for its exceptionally balanced sound reproduction; “pink noise” has only a slight emphasis in the upper-mid/low treble, the bass extension is “very, very good,” and the texture is “breathtaking”; the midrange response renders vocal performances with incredible realism.

Head-Fi.org – Review of Currawong (“Rhamnetin”)

: According to this review, the SR-009 is the most transparent, detailed, and compelling pair of headphones the author has ever heard. He describes the bass, mids, and especially the treble as superior to those of any other headphones, with an impressive soundstage and imaging; comfort is also described as “exquisite.” Downsides include plastic components and a very high dependence on the amplifier and DAC.

The Absolute Sound – “Best of the Best: Stax SR-009 Electrostatic Headphones”

: This review calls the SR-009 a “state-of-the-art” product in the high-end world; the price is described as “staggering,” as is the need for a special electrostatic amplifier. However, according to the author, anyone who listens to a well-configured SR-009 system will have a listening experience that absolutely justifies the investment.

Playback 54 – Chris Martens, “Stax SR-009 Electrostatic Earspeaker”

: highlights the exceptionally low distortion, the neutrality, and the absence of sluggishness in the sound. Bass, mids, and treble are all highly detailed, with a realism that the author considers to be among the very best. The review compares the price point to previous Stax flagship models and calls the SR-009 a significant leap forward.

Testberichte.de – “Stax SR-009 Review”

: gives the SR-009 a score of 1.4 (“Sehr gut”) and praises it as likely the world’s best over-ear headphones, with a neutral, absolutely inertial sound that is unmatched to date and distinguished by complete freedom from distortion. Comfort is described as “höchster Tragekomfort”; somewhat brief compared to in-depth reviews in English.

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The Compact Disc (CD), like most inventions, did not appear out of thin air. After the invention of the laser in 1958, the first patent for optically readable disks was filed in 1961. The first digital video records were introduced in 1972. After a flop by Philips, the manufacturer, together with Sony, released the first CD in 1979. We do not know what it contained, but in 1982 the first CD was released for the market, it was the album Visitors by ABBA. In this year the first player became available and so began the elimination of the LP from the market. Many have literally thrown their LPs in the trash… we still see some visitors being disappointed when they tell us this. Velen hebben hun lp’s letterlijk bij het vuil gezet… sommige bezoekers zien wij nog steeds balen als ze dit vertellen.

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CD

The Compact Disc (CD), like most inventions, did not appear out of thin air. After the invention of the laser in 1958, the first patent for optically readable disks was filed in 1961. The first digital video records were introduced in 1972. After a flop by Philips, the manufacturer, together with Sony, released the first CD in 1979. We do not know what it contained, but in 1982 the first CD was released for the market, it was the album Visitors by ABBA. In this year the first player became available and so began the elimination of the LP from the market. Many have literally thrown their LPs in the trash… we still see some visitors being disappointed when they tell us this. Velen hebben hun lp’s letterlijk bij het vuil gezet… sommige bezoekers zien wij nog steeds balen als ze dit vertellen.
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