Woo Audio
Woo Audio WA24 20th Anniversary Edition Headphone Amplifier
Best reference-level tube amplifier for discerning audiophiles seeking pure sonic clarity.
The Woo Audio WA24 20th Anniversary Headphone Amplifier is a reference-level, Class-A, single-ended tube amplifier designed to deliver an unparalleled headphone listening experience. It features custom-made 3A/109E power tubes and an in-house developed STEP-UP Driver for exceptional clarity and a remarkably low noise floor. The amplifier boasts a two-tier, CNC-machined aluminum chassis, an ALPS volume potentiometer, and multiple headphone outputs, including balanced options. This meticulously crafted amplifier is built for discerning audiophiles seeking the purest sound reproduction and a lifetime of musical enjoyment. The Woo Audio WA24 20th Anniversary Edition is a reference-level, Class-A single-ended vacuum tube headphone amplifier, celebrating two decades of audio innovation. It features a revolutionary STEP-UP Driver, custom 3A/109E power tubes, and oversized output transformers for unparalleled sonic performance. The meticulously designed two-tier aluminum chassis minimizes noise, delivering an exceptionally low noise floor and an immersive listening experience. This amplifier is crafted for audiophiles seeking the purest sound reproduction and a deep connection with their music, embodying Woo Audio's commitment to quality and lasting enjoyment.
$11699.00
Owner Satisfaction
4.7
/ 5
Category Rank
31
/ 766
#31 in Headphone Amplifiers
Price vs Category Average
+738%
Above average
Who it's for
- Audiophiles powering demanding, low-sensitivity planar magnetic headphones
- Listeners seeking rich, holographic, and musical tube-driven sound
- Collectors valuing artisanal point-to-point wiring and limited-edition craftsmanship
Who should skip it
- Users with limited desk space or poor ventilation setups
- Owners wanting a low-maintenance, set-and-forget audio experience
- Budget-conscious buyers seeking high-end performance without the premium price
Performance breakdown
Sonic Transparency
Zero-feedback design delivers an exceptionally pure and uncolored musical presentation.
Build Integrity
Solid CNC-machined aluminum chassis offers unmatched structural rigidity and vibration isolation.
Noise Floor
Advanced shielding and isolation make it perfectly silent even with sensitive IEMs.
Drive Versatility
Effortlessly powers everything from demanding planars to highly sensitive in-ear monitors.
Tactile Precision
The brass-enclosed ALPS potentiometer provides a luxurious and highly accurate volume adjustment.
Connectivity Options
Comprehensive balanced and unbalanced outputs accommodate virtually any high-end headphone cable.
Key Specs
Single-ended, all-tube Class A design with zero-feedback operation
Point-to-Point wiring
Two-tier chassis isolates the tube amplifier from the linear power supply
CNC-machined aluminum chassis milled out of a solid block of aluminum
Headphone outputs
Balanced (4-pin XLR, 4.4mm Pentaconn®), Unbalanced (6.3mm, 3.5mm)
Compatible headphones
8–600 Ohms impedance and 74dB–120dB sensitivity rating
Compatible AC voltage
100v – 240v
Product Weight
38 lbs (17 kg)
Features
- Reference-level amplifier engineered for stunning clarity and detail
- Class-A single-ended topology for the purest amplification
- Oversized output transformer for maximum power and dynamic range
- Groundbreaking in-house developed STEP-UP Driver replaces traditional active drivers for simplified circuitry and enhanced performance
- Two-tier chassis precision-machined from a single block of high-grade aluminum for modern elegance and timeless craftsmanship
- Individually shielded enclosure minimizes internal electrical noise and microphonics for an extraordinarily low noise floor
- 50mm brass-enclosed ALPS Alpine RK50 potentiometer for a refined tactile volume control experience
- 20th Anniversary Edition symbolizing Woo Audio’s commitment to long-lasting products
- Reference-level Class-A single-ended tube amplification with zero-feedback operation
- Revolutionary in-house developed STEP-UP Driver replaces traditional active drivers for simplified circuitry and enhanced performance
- Custom-made 3A/109E direct-heated triode power tubes selected for low noise and durability
- Oversized, in-house developed output transformers ensure maximum power and dynamic range
- Two-tier chassis milled from a solid block of aluminum isolates power supply from the amplifier
- Point-to-point wiring and shortest-path schematic minimize wiring length and interference
- ALPS Alpine RK50 volume potentiometer provides precise and tactile volume control
- Low noise floor suitable for sensitive in-ear monitors (IEMs) and demanding headphones
- Single-ended, all-tube design for expansive soundstage and clarity
- Meticulously crafted with four custom 3A/109E vacuum tubes
What customers say
The Woo Audio WA24 20th Anniversary Edition earns overwhelming praise as an endgame component for serious listeners. Reviewers consistently laud its sonic signature, describing it as lush, organic, and highly resolving while retaining classic tube warmth. The amplifier creates a vast, three-dimensional soundstage with exceptional depth and precise instrument separation, breathing new life into demanding headphones. Its power drives virtually any headphone with authority. Beyond performance, the build quality is impeccable, featuring robust construction and stunning aesthetics. Owners feel the ultra-luxury investment is justified by the world-class engineering and unparalleled listening experience, cementing the WA24 as a masterful achievement in high-fidelity audio design.
Know before you buy
The WA24 is highly versatile, supporting headphones with an impedance range of 8 to 600 Ohms and sensitivity ratings between 74dB and 120dB. This makes it suitable for everything from sensitive in-ear monitors to demanding high-impedance over-ear headphones.
Yes, the amplifier features a comprehensive selection of outputs. You can use balanced headphones via the 4-pin XLR or 4.4mm Pentaconn jacks, or standard unbalanced headphones using the 6.3mm or 3.5mm ports.
The two-tier chassis is CNC-machined from a solid block of aluminum to physically isolate the sensitive tube amplifier circuitry from the linear power supply. This separation significantly reduces internal electrical noise and microphonics, resulting in an exceptionally low noise floor.
The proprietary STEP-UP Driver replaces traditional active driver stages to simplify the internal circuitry. By streamlining the signal path, it enhances overall performance and clarity, contributing to the amplifier's reference-level sound reproduction.
Yes, the WA24 is designed to be compatible with AC voltages ranging from 100v to 240v, making it suitable for use in various international power environments.
The WA24 uses four custom-made 3A/109E direct-heated triode power tubes. While these are selected for their durability and low-noise performance, they are vacuum tubes and will eventually require replacement based on your total hours of usage.
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