Short answer: the Gustard A20H. It ranks #25 of 43 DAC and headphone amp combos by measured performance, rated 4.2/5, at $752; the Woo Audio WA11 Topaz ranks #27, rated 4.1/5, and costs $1,099, which makes this an easy call rather than a real tradeoff.
Why pick the Gustard A20H: A rated 2.4 W balanced into 32 ohms and 264 mW into 300 ohms is enough for planar magnetic and high impedance headphones alike. The tradeoff: Its 103 dB SINAD trails many cheaper rivals, and the Tanchjim Luna rates higher with cleaner measurements for a small fraction of the price.
What the Woo Audio WA11 Topaz does well: It is a portable DAC and headphone amp with a 6 hour battery, USB-C and 4.4 mm balanced analog inputs, and 6.35 mm and 4.4 mm balanced headphone outputs. The catch: The Khadas Tone2 Pro rates higher and measured cleaner in Audio Science Review’s tests for a small fraction of the price.
Buy the Gustard A20H. It is rated higher than the Woo Audio WA11 Topaz and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Still deciding? The full Headphone Amps and DACs rankings cover every ranked option.
Specifications Side By Side
| Gustard A20H | Woo Audio WA11 Topaz | |
|---|---|---|
| Price | $752 | $1,099 |
| Ranked | #25 of 43 in DAC and Headphone Amp Combos | #27 of 43 in DAC and Headphone Amp Combos |
| Device Type | DAC and headphone amp | DAC and headphone amp |
| SINAD | 103 dB (measured by Audio Science Review) | 101 dB (measured by Audio Science Review) |
| Output Power (32 ohms) | 2,400 mW (manufacturer rated, balanced) | 1,200 mW into 30 ohms (manufacturer rated, balanced) |
| Output Power (300 ohms) | 264 mW (manufacturer rated, balanced) | 120 mW (manufacturer rated) |
| Balanced Output | Yes (balanced headphone output, XLR line out) | Yes (4.4 mm) |
| Inputs | USB, I2S (HDMI), AES/EBU, coaxial, optical | USB-C, 4.4 mm balanced analog |
| Outputs | RCA, XLR | - |
| DAC Chip | 2 x AK4497EQ | ESS Sabre (model not specified) |
| Volume Control | Relay attenuator (60 steps) | Hardware knob |
| Dimensions | 13” x 2.6” x 10.2” (330 x 65 x 260 mm) | 6.1” x 3.3” x 1.1” (155 x 85 x 27 mm) |
| Weight | 13.2 lbs (6 kg) | 0.9 lbs (426 g) |
| Headphone Outputs | - | 6.35 mm, 4.4 mm balanced |
| Battery Life | - | 6 hours |
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Prices on this page were last checked October 11, 2026 at 4:59 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Amps and DACs In Full
Gustard A20H: $752 HiFiGo eBay
Pros: A rated 2.4 W balanced into 32 ohms and 264 mW into 300 ohms is enough for planar magnetic and high impedance headphones alike. Inputs include USB, I2S over HDMI, AES/EBU, coaxial and optical, with RCA and XLR line outputs and a 60 step relay volume control. Audio Science Review measured 103 dB SINAD, clean enough for nearly all listening.
Cons: Its 103 dB SINAD trails many cheaper rivals, and the Tanchjim Luna rates higher with cleaner measurements for a small fraction of the price. There is no Bluetooth input, and at 6 kg it is a very large and heavy unit for what it delivers.
Full Gustard A20H review and specifications →
| Balanced Output | Yes (balanced headphone output, XLR line out) |
|---|---|
| DAC Chip | 2 x AK4497EQ |
| Device Type | DAC and headphone amp |
| Dimensions | 13” x 2.6” x 10.2” (330 x 65 x 260 mm) |
| Inputs | USB, I2S (HDMI), AES/EBU, coaxial, optical |
| Output Power (300 ohms) | 264 mW (manufacturer rated, balanced) |
| Output Power (32 ohms) | 2,400 mW (manufacturer rated, balanced) |
| Outputs | RCA, XLR |
| SINAD | 103 dB (measured by Audio Science Review) |
| Volume Control | Relay attenuator (60 steps) |
| Weight | 13.2 lbs (6 kg) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Woo Audio WA11 Topaz: $1,099 Headphones.com eBay
Pros: It is a portable DAC and headphone amp with a 6 hour battery, USB-C and 4.4 mm balanced analog inputs, and 6.35 mm and 4.4 mm balanced headphone outputs. Woo Audio rates it at 1,200 mW into 30 ohms balanced, enough for most planar magnetic headphones, and Audio Science Review measured a SINAD of 101 dB, clean for nearly all listening.
Cons: The Khadas Tone2 Pro rates higher and measured cleaner in Audio Science Review’s tests for a small fraction of the price. Battery life is short at 6 hours, and the 1,200 mW figure applies to the balanced output.
Full Woo Audio WA11 Topaz review and specifications →
| Balanced Output | Yes (4.4 mm) |
|---|---|
| Battery Life | 6 hours |
| DAC Chip | ESS Sabre (model not specified) |
| Device Type | DAC and headphone amp |
| Dimensions | 6.1” x 3.3” x 1.1” (155 x 85 x 27 mm) |
| Headphone Outputs | 6.35 mm, 4.4 mm balanced |
| Inputs | USB-C, 4.4 mm balanced analog |
| Output Power (300 ohms) | 120 mW (manufacturer rated) |
| Output Power (32 ohms) | 1,200 mW into 30 ohms (manufacturer rated, balanced) |
| SINAD | 101 dB (measured by Audio Science Review) |
| Volume Control | Hardware knob |
| Weight | 0.9 lbs (426 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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