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Woo Audio

Woo Audio WA33 (2nd Gen) Headphone Amplifier

Woo Audio WA33 (2nd Gen) Headphone Amplifier

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$13,999.00
$13,999.00
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WA33

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Description

Woo Audio's WA33 has been recognized as one of the world’s finest headphone amplifiers. Today, we raise the bar with the introduction of WA33 2nd Generation. The WA33 2nd Gen is the first of its kind to introduce direct-drive current output for True Ribbon headphones—a technology that bypasses traditional interface limitations.

True Ribbon headphones utilize an ultra-thin strip of aluminum foil suspended in a magnetic field, producing exceptionally low impedance  down to just 0.038Ω. As a result, standard headphone amplifiers are unable to drive them directly. An external interface is typically required to raise the impedance to a level compatible with conventional amplifiers. Our direct-drive technology enables WA33 2nd gen to operate at ultra-low impedance upholding the superior sound quality of true ribbon headphones.

The WA33 2nd Gen removes the need for intermediary devices. With a dedicated current-drive output tailored to ribbon headphones like the RAAL Immanis and Magna. The result is a pure, unaltered signal transmission delivering feather-light transients, massive dynamic range, and breathtaking realism. The way we hear music – naturally.

 

Specifications:

  • Updated to 2nd generation in May 2025

  • Available in Standard and Elite Edition

  • JPS Alumiloy® internal wires available by request ($2000)

  • 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 

  • 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

  • Power consumption: 150w

  • Compatible AC voltage: 100v – 240v

  • 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.

  • Designed and assembled in New York, USA

  • Three-year limited warranty

Let customers speak for us

from 49 reviews

Well, the hype is true. Holographic soundstage, precise separation of vocals and instrumental parts. A tiny magic box that put to shame the muffled sound of my integrated DAC. That one is a keeper.

Anonymous
Chord Qutest Dac

Good selection, helpful staff, quick and free delivery. What more can I say? And it was cheaper than Amazon or its Chinese version.

Roland Wehr
Noteworthy Audio

My headphone listening adventure began about 8 years ago with a purchase of Focal Utopia flagship headphones and a good quality amp and DAC joined together with Nordost cables to my ROON server. The electronic components (DAC and amp) at that time cost me about $7,000 CAD. Two weeks ago I received my LAIV Harmony 𝛍DAC and AUNE S17 Class A headphone amp by courier and even upon first listen I was blown away. I never realized that my Utopias could reach into the music with so much delicacy and bass richness. All without the treble edginess that my wife had on her planar phones. This is not meant to be a Utopia review, but I realized that the Utopias need very fine gear to release their abilities. Gear that cost me about $2,500 CAD. Amazing how much the audio gear has been refined in the last 8 years, for a third of the cost. Five thumbs up.

Roland Wehr
LAIV Audio Harmony uDAC

Nest place to order audio products.

Sungmin Lim
Noteworthy Audio

One of the best headphones in the world.

Sungmin Lim
Meze Audio Elite Headphones

Incredible service. Instant response to all questions.

Alan Szeto
Noteworthy Audio

Really best TWS IEMs I’ve ever listened to. I’ve had Sony xm4, Denon Perl Pro, B&W pi7. These are the best.

Alan Szeto
Noble Audio Fokus Prestige Encore TWS In Ear Monitors NEW ARRIVAL

Nick is knowledgeable in audio and a good person to deal with. Heresponds to inquaries quickly and posseses good communication skills.

Anonymous
Matrix Audio TT-1 Music Server IN STOCK ON SALE

Very good experience. Easy decision to be a repeat customer.

Terry Levesque
Noteworthy Audio

The Arya Organics exceeded expectations. I'm listening to Stanley Turrentine's album Ballads as I comment. The experience is the closest thing to Saturday nights at Walt Harper's Attic when I was much younger. First and only time I heard MJQ in concert.

Anonymous
Hifiman Arya Organic Headphones IN STOCK

Another great transaction with Nick, always a pleasure dealing with him, vast product knowledge and very helpful. This was my first experience purchasing online and the shipping was super fast!
The Aune AR5000 is an absolutely incredible bargain and sounds fantastic.
it was my way of testing the water with a headphone rig and I was absolutely blown away at the performance!

Aaron Badgley
DALI Speakers Fall Promotion ON SALE Savings Up To $2000

This is truely exceptional product. The headphones are lightweight and comfortable. The system produces is a captivating experience. Instruments and vocals just sound 'right'. Most surprisingly, its got bass slam! Enough to satisfy any bass head junkie. I'm continuously blown away by it. It has exceeded all expectations. 5 Stars. It's that good!

Shawn K
Stax SRS-X1000 Bundle

Lovely full range sound rivals my overear cans. Great choice of plugs and sound filters though sounds marvellous with the pre installed green treble filter. Very comfortable and reveal many previously missed details from much loved songs. Great Noteworthy web site and service. Thanks.

James
Fiio FH19 In Ear Monitors

Excellent guidance from the staff, answering my questions regarding the equipment and my particular setup and audio intentions. Made the sale. Also appreciated the very quick shipping and expedited delivery.

Stephen Jakes
Noteworthy Audio

Amazing level up from my $300 headphone amp&DAC. The support and guidance from the staff was instrumental in my decision to get this amp and recommendation not to get the Bluetooth version as it would not add to my particular usage and audio experience. Very pleased with this purchase experience.

Stephen Jakes
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