Woo Audio WA33 (2nd gen) Fully-balanced Headphone Amplifier
Made to order: 6-10 weeks
Overview
Get ready to take your listening game to the next level with the all-new WA33 (2nd generation) amplifier. Building on the success of its predecessor, this latest masterpiece takes high-fidelity sound reproduction to new heights. With expanded output options, you’ll have unprecedented versatility to choose from.
TR (True-ribbon) direct-drive technology with output transformer:
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RAAL 1995
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High current drive with ultra-low impedance
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next generation of ribbon headphones.
HP (traditional headphones), including dynamic and planar dynamic:
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Balanced 4.4mm (Pentaconn®)
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Balanced 4-pin XLR
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Unbalanced 6.3mm TRS
Sonic Performance That Defies Expectations
The enhanced WA33 "house sound" has been further refined.
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A vivid sound image render each note with precision and articulation
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Extraordinary definition that reveals nuances you've never heard before
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Dramatically improved imaging that precisely places each instrument in three-dimensional space
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An expansive, focused soundstage that transports you to the recording venue
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Breathtaking dynamic range that brings music to life with startling realism
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Crystal-clear articulation that renders every note with perfect precision
WA33 2nd gen Standard Edition shown with RAAL 1995 headphone (sold separately)
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Updated to 2nd generation in May 2025
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Available in Standard and Elite Edition
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JPS Alumiloy® internal wires available by request ($2000), contact us
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User selectable outputs:
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TR (True-ribbon) direct-drive without interface
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HP (Traditional headphone)
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Headphone Outputs:
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4-pin XLR balanced for TR (True-ribbon) without interface
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4.4mm balanced (Pentaconn®)
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4-pin XLR balanced
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6.3mm unbalanced TRS
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Same default tubes for all versions: 6C45 driver x 4, 2A3 power x 4, 5U4G rectifier x 1
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Fully balanced design, Push Pull, Class-A
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Polytetrafluoroethylene (PTFE) tube sockets
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TKD (Tokyo Ko-on Denpa) 4-channel balanced smooth potentiometer
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Transformer-coupled, Point-to-Point wiring
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Internal Coupling Architecture (ICA)
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XLR input x 2, RCA input x 1
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Outputs: Dual 3-pin XLR (left and right channel), 4-pin XLR x 1 and 1/4" (6.3mm)
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User selectable HI/LO impedance for HP headphone
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User selectable HI/LO level for two levels of power output
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Headphones impedance: 0.1—600 Ohms
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Frequency response: 10Hz— 60kHz, -2dB
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Current output (TR): 3.3A [optimized for true ribbon technology]
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Power output (HP): up to 10 watts per channel @32 Ohms [ideal for power-demanding headphones]
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Signal/Noise: > 95 dB, THD: < 0.05%, 1kHz
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Anodized aluminum chassis, available in black or silver
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Self-biasing with compatible tubes [chart]
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Power consumption: 150w
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Compatible AC voltage: 100v – 240v
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Dimensions: 17.5"(W), 12"(D), 13"(H) with tubes, weight: 54 lbs for Standard, 57 lbs for Elite Edition. Open airflow is required for ventilation.
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Designed and assembled in New York, USA
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Three-year limited warranty
Highlights
WA33 (2nd gen) Standard Edition. *Specifications and appearance are subject to change for improvement without notice.
Elite Edition
The WA33 “Elite Edition” is the result of our further pursuit of unprecedented performance. Our experienced engineers have selected the best internal components and materials from intensive research and development. Elite Edition embodies a harmonious balance between sophisticated design and technological excellence to satisfy the most demanding music lovers.
Highlights
Elite Edition Adds:
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Ultra high-bandwidth, low-loss output transformers custom-made with Single Crystal Copper wires and Ni Alloy metal
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Single Crystal copper hook-up and signal wires are used throughout
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ALPS RK50 4-channel balanced potentiometer in brass enclosure
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Mundorf MCap Supreme Silver/Gold capacitor for interstage coupling, one per channel (4pcs)
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Mundorf MTube capacitors for voltage filter (3pcs)
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Cardas Audio XLR and WBT RCA connectors
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JPS Alumiloy® internal wires available by request ($2000), contact us
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WA33 Elite Edition 24k gold-plated plaque
Ultra high-bandwidth, low-loss output transformers custom-made with Single Crystal Copper wires and Ni Alloy metal
Single Crystal copper hook-up wires throughout.
Mundorf MTube capacitors for voltage filter
Mundorf MCap Supreme Silver/Gold capacitor for interstage coupling
Alps RK50 4-channel volume control in brass enclosure
Cardas XLR and WBT RCA connectors
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WA33 or WA33 Elite Edition (2nd gen) x 1
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Default tubes are same for all versions
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2A3 tube x 4
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5U4G (5U3C) rectifier tube x 1
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6C45 tube x 4
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Quick start guide
*AC power cord and audio cables are not included
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