Quick Answer
Choose the WA22 (2nd gen) for a fully balanced, all-tube preamp and headphone amp at a practical price. Choose the WA234-MONO (2nd gen) stereo pair if you demand the ultimate SET mono-block performance and are ready to invest in a reference-level system.
Why the WA22 is a practical audiophile staple
The WA22 (2nd gen) has been a favorite since 2009, and the 2nd gen update adds improved sonic performance and a preamplifier feature. Its fully balanced design improves channel separation, soundstage, and imaging—key benefits for critical listening with high-end headphones.
At a fraction of the WA234-MONO's price, the WA22 delivers most of the tube magic in a single chassis. It's also easier to integrate into a desktop setup, making it a strong choice for most headphone enthusiasts.
The WA234-MONO: reference-level mono blocks
The WA234-MONO (2nd gen) is a SET (single-ended triode) mono-block amplifier designed for the ultimate headphone and loudspeaker listening. Its name derives from three legendary power tubes—2A3, 300B, and 45—offering a range of tonal flavors.
The architecturally sculpted aluminum chassis not only looks striking but also eliminates unwanted mechanical vibration, ensuring sonic purity. This is a statement piece for the most demanding systems, but it comes at a premium and requires a stereo pair for stereo operation.
Trade-offs to consider
The WA22 is more versatile: it works as a headphone amp and preamp, and its fully balanced design suits balanced headphones. The WA234-MONO, however, is a mono block—you need two units for stereo, which doubles the cost and footprint.
The WA234-MONO's SET topology and all-triode tubes deliver a purist, single-ended sound that many audiophiles prize. But that purity comes with higher power consumption and a much higher price tag.
How to decide: WA22 vs WA234-MONO
- Budget: If your budget is under $3,000, the WA22 (2nd gen) at around $2,000 is the clear choice. The WA234-MONO costs over $17,000 per stereo pair, so reserve it for serious high-end investments. Set a hard budget before comparing features.
- Balanced vs single-ended: The WA22 is fully balanced, improving channel separation and imaging. The WA234-MONO is single-ended triode, offering a purist SET sound that some prefer for its warmth and musicality. Decide which topology matches your headphones and listening preferences.
- System integration: The WA22 doubles as a preamp for a Hi-Fi system. The WA234-MONO is a mono block—you'll need two units and a separate preamp to drive speakers, which adds complexity. Consider whether you need speaker amplification beyond headphones.
Product facts at a glance
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Woo Audio WA22 (2nd gen) Fully-balanced Headphone Amplifier / Preamplifier: The WA22 (2nd gen) is an all-tube, fully balanced headphone amplifier and preamplifier, first introduced in 2009 and updated in 2018. It offers improved channel separation, soundstage, and imaging, plus the flexibility to drive a Hi-Fi system as a preamp.
Woo Audio WA22 (2nd gen) Fully-balanced Headphone Amplifier / Preamplifier
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Woo Audio WA234-MONO (2nd gen) Headphone / Speakers Amplifier (In Stereo Pair): The WA234-MONO (2nd gen) is a SET mono-block amplifier using three legendary power tubes (2A3, 300B, 45) in an architecturally sculpted aluminum chassis. It delivers reference-level single-ended triode sound with reduced mechanical vibration, but requires a stereo pair for stereo operation.
Woo Audio WA234-MONO (2nd gen) Headphone / Speakers Amplifier (In Stereo Pair)
Who should buy which
Best for
- Audiophiles wanting a fully balanced tube amp with preamp functionality at a practical price.
- Desktop listeners with high-end balanced headphones who value channel separation and soundstage.
Not for
- Those seeking the ultimate SET mono-block performance and willing to invest over $17,000.
- Users who need a compact, single-chassis solution for both headphones and speakers.