Woo Audio - WA22 Headphone Amplifier/Preamplifier


Originally introduced in 2009, WA22 has been an audiophile favorite. New for 2018 is improved sonic performance and preamplifier feature for use with a Hi-Fi system. WA22 (2nd gen) is an all-tube design, fully balanced headphone amplifier and preamplifier. The advantage of a fully balanced system is improved channel separation, more precise soundstage, and imaging. Perfectly suited for the headphone enthusiast and experienced audiophiles seeking flexibility and purest sound.


  • Updated to 2nd generation in March 2018
  • Tubes: 6SN7 driver x 2, 6080 power x 2, 5U4G rectifier x 1
  • Polytetrafluoroethylene (PTFE) tube sockets
  • Fully-balanced design, Class-A
  • Transformer-coupled, Point-to-Point wiring, Pseudo-dual power supply
  • Phase Splitter for use with unbalanced components
  • HI / LO impedance setting
  • XLR input x 1, RCA input x 1
  • Dual 3-pin XLR (left and right channel), 4-pin XLR and 1/4″ (6.3mm) stereo headphone outputs
  • XLR balanced PREAMP output (<50 ohms)
  • ALPS smooth potentiometer
  • Anodized aluminum chassis, available in black or silver
  • Self-biasing with compatible tubes [chart]
  • Global voltage (100v–220v) without converter
  • Dimensions: 7″(H), 12″(W), 10½”(D) amplifier 25 lbs.