Short answer: the Fosi Audio SK02. It ranks #24 of 43 DAC and headphone amp combos by measured performance, rated 4.2/5, at $99.99; the Fosi Audio K7 ranks #26, rated 4.1/5, and costs $199.99, so there is not much of a tradeoff to weigh.
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 tradeoff: Its 105 dB SINAD trails rivals like the Fosi Audio K7 at 116 dB, though the difference is unlikely to matter for most listening.
The case for the Fosi Audio K7: Audio Science Review measured a SINAD of 116 dB, so its noise and distortion are inaudible. The catch: Fosi Audio doesn’t publish a 32 ohm power figure, so its headroom for hard to drive headphones is unclear.
Buy the Fosi Audio SK02. It is rated higher than the Fosi Audio K7 and costs less, which makes it the one to get unless you need something the other one does better.
Still deciding? The full Headphone Amps and DACs rankings cover every ranked option.
Specifications Side By Side
| Fosi Audio SK02 | Fosi Audio K7 | |
|---|---|---|
| Price | $99.99 | $199.99 |
| Ranked | #24 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 | 105 dB (measured by Audio Science Review) | 116 dB (measured by Audio Science Review) |
| Output Power (32 ohms) | 755 mW (manufacturer rated, balanced) | - |
| 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, optical | USB-C, optical, coaxial, Bluetooth, 3.5 mm mic |
| Outputs | 3.5 mm line out, optical | RCA |
| DAC Chip | ES9038Q2M | AK4493SEQ |
| Volume Control | Hardware knob | Hardware knob |
| Dimensions | 4.8” x 2” x 1.7” (121 x 51 x 43 mm) | - |
| Weight | 0.8 lbs (380 g) | - |
| Bluetooth Codecs | - | SBC, aptX HD, aptX LL |
| Equalizer | - | Yes (bass and treble knobs) |
Related Amp and DAC Comparisons
How Fosi Audio SK02 compares with other leading options:
- Topping DX1 II vs Fosi Audio SK02
- Tanchjim Luna vs Fosi Audio SK02
- Fosi Audio SK02 vs Khadas Tone2 Pro
- Fosi Audio SK02 vs SMSL D12
- Fosi Audio SK02 vs Loxjie D30
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
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
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