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Woo Audio 3ES ELITE Headphone Amplifier w/Massive Upgrades AND STAX SR-009 Headphones

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Pickup currently unavailable at SkyFi 479

Woo Audio 3Es Elite Headphone Amplifier W/Massive Upgrades And Stax Sr-009 Headphones

Woo Audio 3ES ELITE Headphone Amplifier w/Massive Upgrades AND STAX SR-009 Headphones

SkyFi 479

Pickup currently unavailable

479 South Broad Street
Glen Rock NJ 07452
United States


Top of the line Woo Audio Electrostatic headphone amplifier, and arguably the best headphone amplifier available.

Fitted with a set of like new STAX SR-009 Headphones.

This is not only the Elite version, but it's fitted with all the upgrades possible. Including Takatsuki 300B's ($4,400), RCA 6SN7's, RCA Red Base 5692's ($699), and a Western Electric 274B Rectifier tube front and center ($1,250).

This listing also includes a pair of STAX SR009 Headphones, which are a match made in heaven. Headphones are like new in original box, and they sound they reproduce can be described as "effortless" for starters.

The Elite Version with JPS wires alone retails for $17K.
With upgrades, it shoots up to $23,348.
SAX flagship headphones retail for $4,325.
Grand Total MSRP for this full listing is $27,600

The headphones are like new in original box, and the Amplifier is also like new.

Everything was fully tested in our lab and working to manufacturer specification.

Elite Edition Adds:
• Mundorf Supreme Silver/Gold audio capacitors
• Single Crystal copper hook-up and signal wires  throughout
• Alps RK50 4-channel volume control in a brass enclosure
• Cardas Audio XLR and WBT style RCA connectors
• 3ES Elite Edition 24k gold-plated plaque

With over 10 years of experience in electrostatic amplifier designs. The all-new 3ES is our flagship electrostatic headphone amplifier and preamplifier. It shares the same architecture as our flagship WA33 dynamic headphone amplifier in a two-unit design where the top unit is an amplifier docking on the power supply using our internal coupling architecture (ICA) technology. The 3ES employs two 6SN7 driver tubes pushing four 300B power tubes as the output stage and one rectifier tube in the center of the amp. The new 3ES achieves the most ambitious dream in the audio world.


  • Compatible with 5-pin 580v (Pro-bias) for STAX, HiFiMan, MrSpeakers headphones

  • Dual headphone output [simultaneous operation]

  • Compatible with all STAX, HiFiMan Shangri-la Jr., Dan Clark Audio VOCE electrostatic headphones

  • TKD (Tokyo Ko-on Denpa) 4-channel balanced smooth potentiometer

  • XLR input x 2, RCA input x 1

  • User selectable output: pre-amp or headphone

  • Maximum output 1500Vrms

  • Anodized aluminum chassis, available in black or silver

  • Self-biasing with compatible tubes

  • Dimensions [without tubes]: 17 3/4" (W), 7 1/4" (H), 13 1/2" (D) / 450.85mm (W), 184.15mm (H), 342.90mm (D), weight: 52 lbs. / 24 kg.

  • Voltage: AC 100 - 120V 60HZ or AC220 - 240V, 50HZ, voltage built to destination country

  • Designed and assembled in New York, USA


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.

• 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)

Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.



Original Box





Not Applicable


Yes - Power

Physical Condition


Working Condition


SKU: 102159