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Woo Audio - WA33 (2nd Gen)
Fully-Balanced Headphone Amplifier
Overview -The Pinnacle of Headphone Amplification
Since its debut in 2017, the WA33 has been recognized as one of the world’s finest headphone amplifiers. As headphone technology evolves and advances, so must the amplifier. Today, we raise the bar with the introduction of WA33 2nd Generation, a new performance benchmark for the next generation of high-end headphones.
Dual Output Modes for Maximum Compatibility
The WA33 2nd Gen offers two discrete output modes, each optimized for a specific headphone type:
HP Mode: Traditional headphones, such as dynamic and planar magnetic
TR Mode: Current-drive for ultra-low impedance True Ribbon headphones
This dual-mode architecture ensures peak performance across a wide spectrum of headphones, without compromise to signal integrity, resolution, or safety.
Feature Set includes:
Updated to 2nd generation in May 2025
Available in Standard and Elite Edition
JPS Alumiloy® internal wires available by request ($2000), contact us
User selectable outputs:
TR (True-ribbon) direct-drive without interface
HP (Traditional headphone)
Headphone Outputs:
4-pin XLR balanced for True-ribbon (TR) without interface
4.4mm balanced (Pentaconn®)
4-pin XLR balanced
6.3mm unbalanced TRS
Same default tubes for all versions: 6C45 driver x 4, 2A3 power x 4, 5U4G rectifier x 1
Self-biasing with compatible tubes [chart]
Fully balanced design, Push Pull, Class-A
Polytetrafluoroethylene (PTFE) tube sockets
TKD (Tokyo Ko-on Denpa) 4-channel balanced smooth potentiometer
Transformer-coupled, Point-to-Point wiring
Internal Coupling Architecture (ICA)
XLR input x 2, RCA input x 1
User selectable HI/LO impedance for HP headphone
User selectable HI/LO level for two levels of power output
Headphones impedance: 0.038—600 Ohms
Frequency response: 10Hz— 60kHz, -2dB
Current output (TR): 3.3A [optimized for true ribbon technology]
Power output (HP): up to 10 watts per channel @32 Ohms [ideal for power-demanding headphones]
Signal/Noise: > 95 dB, THD: < 0.05%, 1kHz
Anodized aluminum chassis, available in black or silver
The WA33 (2nd gen) 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.
Elite Edition Adds:
Ultra high-bandwidth, low-loss output transformers custom-made with Single Crystal Copper wires and Ni Alloy metal
Single Crystal copper hook-up and signal wires are used throughout
ALPS RK50 4-channel balanced potentiometer in brass enclosure
Mundorf MCap Supreme Silver/Gold capacitor for interstage coupling, one per channel (4pcs)
Mundorf MTube capacitors for voltage filter (3pcs)
Cardas Audio XLR and WBT RCA connectors
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