Short answer: the Fosi Audio SK02. Both are rated 4.2/5 (#24 and #23 of 43 DAC and headphone amp combos), and the Fosi Audio SK02 costs $99.99 against $149.59 for the SMSL D12, with the ratings tied, the lower price decides it.
What the Fosi Audio SK02 does well: It is rated for 755 mW into 32 ohms from its 4.4 mm balanced output, enough for most planar magnetic headphones. Watch for: Its 105 dB SINAD trails rivals like the Fosi Audio K7 at 116 dB, though the difference is unlikely to matter for most listening.
What the SMSL D12 does well: Audio Science Review measured 115 dB SINAD, which puts its noise and distortion at the point of being inaudible. Watch for: It has only a 6.35 mm output with no balanced jack and no optical or coaxial input.
Buy the Fosi Audio SK02. Both are rated the same, and it costs $49.60 less than the SMSL D12.
Looking for alternatives? See the complete Headphone Amps and DACs rankings.
Specifications Side By Side
| Fosi Audio SK02 | SMSL D12 | |
|---|---|---|
| Price | $99.99 | $149.59 |
| Ranked | #24 of 43 in DAC and Headphone Amp Combos | #23 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) | 115 dB (measured by Audio Science Review) |
| Output Power (32 ohms) | 755 mW (manufacturer rated, balanced) | 300 mW (manufacturer rated) |
| Headphone Outputs | 3.5 mm, 4.4 mm balanced | 6.35 mm |
| Balanced Output | Yes (4.4 mm) | No |
| Inputs | USB, optical | USB-C, Bluetooth |
| Outputs | 3.5 mm line out, optical | RCA |
| DAC Chip | ES9038Q2M | AK4493S |
| Volume Control | Hardware knob | - |
| Dimensions | 4.8” x 2” x 1.7” (121 x 51 x 43 mm) | 5.5” x 1.3” x 4” (139 x 33 x 102.5 mm) |
| Weight | 0.8 lbs (380 g) | 0.8 lbs (355 g) |
Related Amp and DAC Comparisons
More top alternatives to SMSL D12:
- SMSL DL100 vs SMSL D12
- SMSL DS20 vs SMSL D12
- Tanchjim Luna vs SMSL D12
- Khadas Tone2 Pro vs SMSL D12
- SMSL D12 vs Fosi Audio K7
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
SMSL D12: $149.59 HiFiGo eBay
Pros: Audio Science Review measured 115 dB SINAD, which puts its noise and distortion at the point of being inaudible. SMSL rates it at 300 mW into 32 ohms, enough for most headphones, and it adds Bluetooth alongside USB C plus RCA outputs for powered speakers.
Cons: It has only a 6.35 mm output with no balanced jack and no optical or coaxial input. The Tanchjim Luna rates higher with similar SINAD for less, and 300 mW is not enough for demanding planar magnetic headphones.
Full SMSL D12 review and specifications →
| Balanced Output | No |
|---|---|
| DAC Chip | AK4493S |
| Device Type | DAC and headphone amp |
| Dimensions | 5.5” x 1.3” x 4” (139 x 33 x 102.5 mm) |
| Headphone Outputs | 6.35 mm |
| Inputs | USB-C, Bluetooth |
| Output Power (32 ohms) | 300 mW (manufacturer rated) |
| Outputs | RCA |
| SINAD | 115 dB (measured by Audio Science Review) |
| Weight | 0.8 lbs (355 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons