Short answer: the SMSL DS20. It ranks #16 of 43 DAC and headphone amp combos by measured performance, rated 4.5/5, at $189.99; the Fosi Audio K7 ranks #26, rated 4.1/5, and costs $199.99, which makes this an easy call rather than a real tradeoff.
The SMSL DS20 is the better-sounding pick. Audio Science Review measured a SINAD of 116 dB, so its noise and distortion are inaudible. The catch: It only accepts USB-C, with no optical, coaxial or Bluetooth input, and volume is set with buttons.
The case for the Fosi Audio K7: Audio Science Review measured a SINAD of 116 dB, so its noise and distortion are inaudible. The tradeoff: Fosi Audio doesn’t publish a 32 ohm power figure, so its headroom for hard to drive headphones is unclear.
Buy the SMSL DS20. It is rated higher than the Fosi Audio K7 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
| SMSL DS20 | Fosi Audio K7 | |
|---|---|---|
| Price | $189.99 | $199.99 |
| Ranked | #16 of 43 in DAC and Headphone Amp Combos | #26 of 43 in DAC and Headphone Amp Combos |
| Device Type | DAC and headphone amp | DAC and headphone amp |
| SINAD | 116 dB (measured by Audio Science Review) | 116 dB (measured by Audio Science Review) |
| Output Power (32 ohms) | 500 mW (manufacturer rated) | - |
| Output Power (300 ohms) | 120 mW (manufacturer rated) | - |
| Headphone Outputs | 3.5 mm, 4.4 mm balanced | 3.5 mm, 4.4 mm balanced |
| Balanced Output | Yes (4.4 mm) | Yes (4.4 mm) |
| Inputs | USB-C | USB-C, optical, coaxial, Bluetooth, 3.5 mm mic |
| DAC Chip | 4 x CS43131 | AK4493SEQ |
| Volume Control | Digital (buttons) | Hardware knob |
| Dimensions | 2.8” x 4.7” x 0.7” (71 x 118.5 x 17 mm) | - |
| Weight | 0.6 lbs (275 g) | - |
| Outputs | - | RCA |
| Bluetooth Codecs | - | SBC, aptX HD, aptX LL |
| Equalizer | - | Yes (bass and treble knobs) |
Related Amp and DAC Comparisons
More top alternatives to SMSL DS20:
- Topping DX1 II vs SMSL DS20
- SMSL DL100 vs SMSL DS20
- Topping DX3 Pro+ vs SMSL DS20
- Fosi Audio ZH3 vs SMSL DS20
- SMSL DS20 vs Schiit Magni Unity with Mesh DAC
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
SMSL DS20: $189.99 Amazon eBay
Pros: Audio Science Review measured a SINAD of 116 dB, so its noise and distortion are inaudible. A rated 500 mW into 32 ohms and 120 mW into 300 ohms drives most headphones, through 3.5 mm or 4.4 mm balanced outputs. At 17 mm thick and 275 g, it is slim enough to sit on a desk or travel in a bag.
Cons: It only accepts USB-C, with no optical, coaxial or Bluetooth input, and volume is set with buttons. The Topping DX1 II rates higher, measures cleaner and adds optical input for less. The Fosi Audio ZH3 offers far more rated power for a similar price.
Full SMSL DS20 review and specifications →
| Released | May 2025 (1 year ago) |
|---|---|
| Balanced Output | Yes (4.4 mm) |
| DAC Chip | 4 x CS43131 |
| Device Type | DAC and headphone amp |
| Dimensions | 2.8” x 4.7” x 0.7” (71 x 118.5 x 17 mm) |
| Headphone Outputs | 3.5 mm, 4.4 mm balanced |
| Inputs | USB-C |
| Output Power (300 ohms) | 120 mW (manufacturer rated) |
| Output Power (32 ohms) | 500 mW (manufacturer rated) |
| SINAD | 116 dB (measured by Audio Science Review) |
| Volume Control | Digital (buttons) |
| Weight | 0.6 lbs (275 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Fosi Audio K7: $199.99 Amazon eBay
Pros: Audio Science Review measured a SINAD of 116 dB, so its noise and distortion are inaudible. It is unusually flexible for the money, with USB, optical, coaxial and Bluetooth inputs (SBC, aptX HD, aptX LL), RCA line out, a 4.4 mm balanced headphone jack, a microphone input and bass and treble knobs.
Cons: Fosi Audio doesn’t publish a 32 ohm power figure, so its headroom for hard to drive headphones is unclear. The SMSL DS20 rates higher for a little less, and the Fosi Audio SK02 rates slightly higher for much less. Its Bluetooth lacks AAC and LDAC.
Full Fosi Audio K7 review and specifications →
| Released | Apr 2025 (1 year ago) |
|---|---|
| Balanced Output | Yes (4.4 mm) |
| Bluetooth Codecs | SBC, aptX HD, aptX LL |
| DAC Chip | AK4493SEQ |
| Device Type | DAC and headphone amp |
| Equalizer | Yes (bass and treble knobs) |
| Headphone Outputs | 3.5 mm, 4.4 mm balanced |
| Inputs | USB-C, optical, coaxial, Bluetooth, 3.5 mm mic |
| Outputs | RCA |
| SINAD | 116 dB (measured by Audio Science Review) |
| Volume Control | Hardware knob |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons