Short answer: the Topping DX1 II. It ranks #6 of 43 DAC and headphone amp combos by measured performance, rated 4.9/5, at $119. The Fosi Audio SK02 ranks #24, rated 4.2/5, at $99.99, $19.01 cheaper, which does not close the gap in measured performance.
The Topping DX1 II is the better-sounding option. Audio Science Review measured a SINAD of 121 dB, so its noise and distortion are inaudible. Watch for: Inputs are limited to USB-C and optical, with no coaxial or Bluetooth.
The case for the Fosi Audio SK02: It is rated for 755 mW into 32 ohms from its 4.4 mm balanced output, enough for most planar magnetic headphones. The catch: Its 105 dB SINAD trails rivals like the Fosi Audio K7 at 116 dB, though the difference is unlikely to matter for most listening.
Buy the Topping DX1 II. It is rated higher, and the $19.01 saving on the Fosi Audio SK02 is not enough to make up the difference.
Looking for alternatives? See the complete Headphone Amps and DACs rankings.
Specifications Side By Side
| Topping DX1 II | Fosi Audio SK02 | |
|---|---|---|
| Price | $119.00 | $99.99 |
| Ranked | #6 of 43 in DAC and Headphone Amp Combos | #24 of 43 in DAC and Headphone Amp Combos |
| Device Type | DAC and headphone amp | DAC and headphone amp |
| SINAD | 121 dB (measured by Audio Science Review) | 105 dB (measured by Audio Science Review) |
| Output Power (32 ohms) | 1,000 mW (manufacturer rated, balanced) | 755 mW (manufacturer rated, balanced) |
| Output Power (300 ohms) | 230 mW (manufacturer rated, balanced) | - |
| Headphone Outputs | 3.5 mm (TRRS headset with mic), 4.4 mm balanced | 3.5 mm, 4.4 mm balanced |
| Balanced Output | Yes (4.4 mm) | Yes (4.4 mm) |
| Inputs | USB-C, optical | USB, optical |
| Outputs | RCA, 4.4 mm balanced line out, optical | 3.5 mm line out, optical |
| DAC Chip | ES9039Q2M | ES9038Q2M |
| Equalizer | Yes (10-band parametric) | - |
| Dimensions | 3.9” x 1.3” x 3.9” (100 x 32 x 100 mm) | 4.8” x 2” x 1.7” (121 x 51 x 43 mm) |
| Volume Control | - | Hardware knob |
| Weight | - | 0.8 lbs (380 g) |
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- Topping DX1 II vs Tanchjim Luna
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
Topping DX1 II: $119.00 Amazon eBay
Pros: Audio Science Review measured a SINAD of 121 dB, so its noise and distortion are inaudible. A rated 1,000 mW into 32 ohms from the 4.4 mm balanced output handles most planar magnetic headphones, and a 10-band parametric EQ and a 3.5 mm headset jack with mic support are included. It rates the same as the D&A Alpha Pro for a fraction of the cost.
Cons: Inputs are limited to USB-C and optical, with no coaxial or Bluetooth. Its 230 mW into 300 ohms is modest beside the Topping DX5 II, which rates the same with far more power but costs more. No volume knob is listed.
Full Topping DX1 II review and specifications →
| Released | May 2026 (5 months ago) |
|---|---|
| Balanced Output | Yes (4.4 mm) |
| DAC Chip | ES9039Q2M |
| Device Type | DAC and headphone amp |
| Dimensions | 3.9” x 1.3” x 3.9” (100 x 32 x 100 mm) |
| Equalizer | Yes (10-band parametric) |
| Headphone Outputs | 3.5 mm (TRRS headset with mic), 4.4 mm balanced |
| Inputs | USB-C, optical |
| Output Power (300 ohms) | 230 mW (manufacturer rated, balanced) |
| Output Power (32 ohms) | 1,000 mW (manufacturer rated, balanced) |
| Outputs | RCA, 4.4 mm balanced line out, optical |
| SINAD | 121 dB (measured by Audio Science Review) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Fosi Audio SK02: $99.99 Amazon eBay
Pros: It is rated for 755 mW into 32 ohms from its 4.4 mm balanced output, enough for most planar magnetic headphones. Audio Science Review measured a SINAD of 105 dB, clean for nearly all listening, and it rates higher than the pricier Fosi Audio K7. It also has USB and optical inputs plus line and optical outputs.
Cons: Its 105 dB SINAD trails rivals like the Fosi Audio K7 at 116 dB, though the difference is unlikely to matter for most listening. There is no Bluetooth or coaxial input and no RCA output for powered speakers, only a 3.5 mm line out.
Full Fosi Audio SK02 review and specifications →
| Released | Feb 2024 (2 years ago) |
|---|---|
| Balanced Output | Yes (4.4 mm) |
| DAC Chip | ES9038Q2M |
| Device Type | DAC and headphone amp |
| Dimensions | 4.8” x 2” x 1.7” (121 x 51 x 43 mm) |
| Headphone Outputs | 3.5 mm, 4.4 mm balanced |
| Inputs | USB, optical |
| Output Power (32 ohms) | 755 mW (manufacturer rated, balanced) |
| Outputs | 3.5 mm line out, optical |
| SINAD | 105 dB (measured by Audio Science Review) |
| Volume Control | Hardware knob |
| Weight | 0.8 lbs (380 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons