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WES (2nd gen) Electrostatic Amplifier + STAX SR-009 System PKG


WES (2nd gen) Electrostatic Amplifier + STAX SR-009 System PKG

6,800.00 8,000.00
  • BTO, ships in 3 weeks

  • Limited time, FREE shipping worldwide!


System Overview

WES (2nd gen) [Standard Build] is the ultimate electrostatic headphone amplifier for use with STAX headphones. The new 2nd gen uses a matching quad of output loading chokes utilizing Single Crystal Copper wires (the purest form of copper) with our proprietary winding scheme. The results are a significant improvement in clarity, sound space, dynamic range, and control. WES is a two-chassis system comprising a power supply and a fully balanced amplifier and innovative dual power switch that treats the tubes more gently when starting the unit from cold. Turning on just one of the power switches provides low voltage to the heaters while the WES remains in standby mode. Turning on both power switches allows the unit to operate at full power. WES will reward the listener with reference quality sound without fatigue.

The SR-009 is the product of the repeated research trip to technology and material search without deviating from our stance to return to live sound and music always with refined sensitivity. It will exactly be as a result of "work" each predecessor piled up, if a race, a company, and an individual have "pride". And it clearly depends on the way of life we live now to inherit it and to bear "enhancement" and "evolution." Simply this is proven by the fact that the state-of-the-art technologies in the world exist intensively in present-day Japan . Making valuable new things full of creativity by skillfully taking advantage of these technologies has given birth to a "millennium" earspeaker (electrostatic headphone).



  • Updated to 2nd generation in April 2017

  • Tubes: EL34 power x 4, 6SL7 driver x 4, 5AR4 rectifier x 2, 12AU7 phase inverter x 2

  • Polytetrafluoroethylene (PTFE) tube sockets

  • Two 12AU7 phase splitter (unbalanced input to balanced input conversion)

  • Fully-balanced design, Class-A

  • Transformer-coupled, Point-to-Point wiring

  • Pseudo-dual power supply

  • STAX Pro Bias 5-pin EarSpeakers output x 2

  • XLR input x 2, RCA input x 1

  • Auricap capacitors for interstage and output coupling

  • Mills and Kiwame resistors

  • Balanced smooth potentiometer

  • Anodized aluminum chassis, available in black or silver

  • Self-biasing with compatible tubes [chart]

  • Global voltage (100v–220v) without converter

  • Dimensions: Amplifier: 7½"(H), 16½"(W), 12"(D) 20 lbs., Power supply unit: 4½"(H), 16½"(W), 12"(D) 20 lbs., DC cord length: 18” (end to end)


  • 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

  • Made in Japan

  • Woo Audio is an authorized reseller

System Highlights

*Specifications and appearance are subject to change for improvement without notice.

*Specifications and appearance are subject to change for improvement without notice.


  • Quick start guide

  • WES (2nd gen) [Standard Build] electrostatic headphone amplifier x 1

  • WES (2nd gen) power supply unit x 1

  • EL34 vacuum tubes x 4

  • 6SL7 vacuum tubes x 4

  • 5AR4 vacuum tubes x 2

  • 12AU7 vacuum tubes x 2

  • Umbilical DC cord x 1


  • STAX SR-009 headphone x 1

  • Storage box x 1

  • Owners manual x 1

*AC power cord and audio cables are not included

In the box


Power Tube Upgrade

EL34-PH Psvane Tube (In Quad)

Driver Tube Upgrade

Rectifier Tube Upgrade


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