Woo Audio WA2 Single-Ended OTL Headphone Amplifier

"A Phenomenal Value"

The Woo Audio WA2 is a high performance headphone amplifier that's perfect for even the most power hungry headphones. It uses a singled-ended triode, 'Class A' all-tube-drive OTL (output transformer-less) design for pristine sound quality.

"We're used to the sound of our most highly rated headphones through our existing, impressive-in-their-own-right amplifiers, but the WA2 breathes phenomenal new life into even the greatest headphones on the planet," reports Nate Lanxon at CNET.co.uk. "Highly recommended."

"One of the Most Musically Involving I Have Heard"

"As a headphone amplifier, WA2 is one of the most musically involving amplifiers I have heard, and for the price, awfully close to the state-of-the-art," notes Linden Park, EnjoyTheMusic.com. "It may be unparalleled among the products in the marketplace now and represents a phenomenal value."

"Iron-Fisted Control of Any Headphone"

"The Woo Audio WA2 headphone amplifier-preamp is one of the highlights of the year. It's quiet beyond the normal noise floor, lifelike musically, soldered by hand, very nicely designed, and fairly priced," notes Matej Isak in a December 2010 review at MonoAndStereo.com.

"[The WA2] has iron-fisted control of any headphone I throw at it, and most importantly – it communicates with me and my emotions," marvels xenithon at head-fi.org.

Meticulously Made Inside and Out

The WA2 is a high quality, meticulously made product inside and out that uses point-to-point wiring throughout its construction. It uses a premium 120-watt toroidal power transformer for quiet, dependable operation with an individual filter choke and rectifier per channel. An Alps potentiometer and power switch plus silver plated Teflon wires add to the performance.

The casework boasts an aluminum die-cast chassis with an anodized finish along with aluminum volume knobs and power switch button.

For smooth, rich audiophile performance, you can't beat the sound of vacuum tubes. The WA2's tube complement consists of two 6AS7/6080 power tubes, two 6922/6DJ8 drive tubes, and two EZ80 rectification tubes.

"Worth Every Single Bit of Its Price"

"I have had various solid-state amps and a modded X-Cans that I still use daily in my office, but this is the first headphone amp I have owned that made me feel like I was in the middle of the music.," raves KillerB, head-fi.org, April 7, 2022

"I’ve very much enjoyed the company of the Woo Audio WA2," observes longtime headphonia.com reviewer Lieven. "My love for this terrific sounding and looking amplifier has only grown from the day it got here… If you have made it to the end of this review I am sure it is clear this Woo Audio 2 is a great piece of equipment and it is worth every single bit of its price."

"The bass is well defined and generous and reaches deep. Highs are crisp and clear, mids are clear and delicate," notes ardilla at head-fi.org.

The Connectivity You Need

You get the connectivity you need with your Woo. It provides four pairs of selectable RCA inputs and one TRS 1⁄4" stereo headphone jack.

Adventures in Tube Rolling

This Woo Audio product is perfect for tweakers who love to experiment with their gear. Changing the sound quality is as easy as trying a different set of audio tubes as an alternative to the tubes that come standard with your Woo. You’ll find lots of suggestions for ‘tube rolling’ on the Internet on head-fi.org and other audiophile Websites. So roll your own and enjoy!

Handcrafted and Made in the USA

Woo Audio takes great pride in every component that the company designs and manufactures. All products are handcrafted, and they're made in the USA.

"Tender, Full Bodied, Lush"

"The WA2 is tender, more full-bodied, polite, lush. It delivers quite a bit of wattage, and I find it to be a good match for the planars/orthos I have tried," observes the Headphoneer at headphoneer.com, April 24, 2023.

Chris Allen at head-fi.org notes, "I really enjoyed this amp overall and would recommend it as a starting point for anybody looking to get into more serious tube amps. So far this has been my favorite Woo product build quality is 2nd to none."

"The WA2 is among the better headphone amps available. It actually surprises me that it's not even more popular than it is," concludes Skylab, also at head-fi.org.

Note: This latest version of this headphone amp no longer features RCA outputs and the output selector. It cannot be switched over to act as a preamp.

Note: An AC power cord and interconnect cables are not included with this model.

Product Features

Point-to-Point wiring
Two 6AS7 / 6080 power tubes
Two 6922 / 6DJ8 drive tubes
Two EZ80 rectification tubes
Pseudo-dual power supply
Four pairs of selectable RCA inputs
One TRS (1⁄4" or 6.35mm) stereo headphone jack
Full aluminum die-cast chassis, anodized finish
Whole aluminum volume knobs and power switch button
120 watts toroidal power transformer
Individual filter choke and rectifier per channel
Silver plated Teflon-jacketed wires
Alps potentiometer and power switch
Silver-plated hook-up wires in Telfon jacket
Handcrafted
Made in the USA

Note: AC power cord and interconnect cables are not included with this model.

Product Specs

Headphones impedance : 25-600 Ohms
Input impedance: 100 Kilo-Ohms
Frequency response: 8 Hz - 100 KHz -3dB
Signal/Noise: 95 dB
THD: <= 0.08%
Voltage: Dual AC operation 110/220V, 50/60 Hz
External dimension: 5-1/2" (H), 13" (W), 9" (D)
Weight: 17 lbs

Product Warranty

Parts & Labor

1 Year

Woo Audio Warranty Information

Product Manual

	Woo Audio WA2 Manual (PDF Format)

"We're used to the sound of our most highly rated headphones through our existing, impressive-in-their-own-right amplifiers, but the WA2 breathes phenomenal new life into even the greatest headphones on the planet, our favourite for use with this setup being the Sennheiser HD 650s or Denon AH-D7000."

"It may not rise to the greater heights reached by the more costly Woo Audio gear, but at this price point it blew away everything we've ever heard. Highly recommended"

- Nate Lanxon, CNET.co.uk, November 26, 2008

"As a headphone amplifier, WA2 is one of the most musically involving amplifiers I have heard, and for the price, awfully close to the state-of-the-art. If one considers the price/performance quotient, it may be unparalleled among the products in the marketplace now and represents a phenomenal value."

- Linden Park, EnjoyTheMusic.com

"The Woo Audio WA2 headphone amplifier-preamp is one of the highlights of the year. It's quiet beyond the normal noise floor, lifelike musically, soldered by hand, very nicely designed, and fairly priced."

"Woo Audio again and again promotes clever solutions and great sounding components. The WA2 is no brainer purchase for a true audio enthusiast. It's a personal recommendation and a stand out product of the year."

- Matej Isak, MonoAndStereo.com, December 2010

“[The WA2] has iron-fisted control of any headphone I throw at it, and most importantly – it communicates with me and my emotions."

- xenithon, head-fi.org

"I have had various solid-state amps and a modded X-Cans that I still use daily in my office, but this is the first headphone amp I have owned that made me feel like I was in the middle of the music."

- KillerBhead-fi.org, April 7, 2022

"I’ve very much enjoyed the company of the Woo Audio WA2. My love for this terrific sounding and looking amplifier has only grown from the day it got here. I’m sad already thinking of the day I will have to put it back in its box for who knows what reason. If you have made it to the end of this review I am sure it is clear this Woo Audio 2 is a great piece of equipment and it is worth every single bit of its price. "

- Lieven, headphonia.com, November 9, 2013

"The bass is well defined and generous and reaches deep. Highs are crisp and clear, mids are clear and delicate."

"The WA2 silkiness is just so appealing, and I found myself preferring it to the powerful presentation of WA22 more often than I'd thought."

- ardilla, head-fi.org, August 20, 2012 and August 21, 2012

"The WA2 is a tube amp. Pure and simple and it doesn't apologize for that in the least. Nor should it. It's a very smooth amp. It's laid back and relaxed when compared to the 6SE. I hate to use the term "organic" to describe an amp, but for lack of a better word, I'll say it. The WA2 has a lot of flow to it."

- baka1969, head-fi.org, September 20, 2008

"The WA2 is tender, more full-bodied, polite, lush. It delivers quite a bit of wattage, and I find it to be a good match for the planars/orthos I have tried."

- headphoneer, April 24, 2023

"I really enjoyed this amp overall and would reccomend it as a starting point for anybody looking to get into more serious tube amps. So far this has been my favorite Woo product build quality is 2nd to none."

- Chris Allen, head-fi.org, November 1, 2016

"The WA2 is among the better headphone amps available. It actually surprises me that it's not even more popular than it is. The WA2 has some pretty impressive power delivery, and it works wonders with high-impedance cans like the Beyerdynamic T1, and is also remarkably good with the Audeze LCD-2 and HifiMan HE-5LE."

- Skylab, head-fi.org, October 13, 2010

"There's something magical about the amp, something pure in its presentation: it makes sense of complicated musical passages that, on lesser--even if more expensive--amplifiers, are just confused convolutions. To call this amp awe-inspiring is simply to state fact: I have whiled away untold hours listening in awe."

- Chesterfield, head-fi.org, October 10, 2014

Both the WA2 and WA22 are incredible amps, no doubt to my ears. Woo Audio really should be commended for not just their sonic prowess, but their incredible construction. Talk about SOLID and 'audio-art'. Breathtaking."

- head-fi.org

Audio Advisor occasionally has fantastic deals on clearance items that are in excellent condition and we happen to have just one or two of.

Demo: Photo samples, gear we auditioned, items returned for wrong color/wrong size, etc.

Open Box: Contents briefly examined or inspected for promotional or internal purposes

Factory Refreshed: Original-condition items repackaged by the manufacturer

Cosmetically Blemished: A few dings or scratches, but functionally in original condition

Used: May show some signs of use

All clearance products are carefully inspected by our technicians before we offer the item for sale. All clearance products except Used items come with the original manufacturer warranty and are guaranteed to work and sound like new.

RETURN POLICY & PROCESS

NOTE:
You may only return a product purchased within 60-days of the receipt date.
The product must be in like-new condition and shipped in the original packaging (So SAVE THOSE BOXES!!!)

Call 1-800-942-0220 to request an RMA number.
Print the RMA number on the return shipping label.
Please make sure the return shipping name and address are written in a note on the inside.
Ship package to…

Audio Advisor Returns
5500 Executive Parkway SE
Grand Rapids, MI 49512
(PRINT YOUR RMA NUMBER HERE)

NOTE: If a coupon was used in the ordering process, then the final value (recorded during payment) will be the price refunded.

Returned products are inspected by our warehouse and refunds are issued within 24 hours of inspection. Please note: it may take 7-10 business days for your bank to show the refunded amount. If you do not see it then, please reach out to our customer service team at 1-800-942-0220.

Audio Advisor will ship products anywhere in the United States, including Alaska, Hawaii, and U.S. Territories.