Fosi Audio SK02
- 23 reviews
- Fosi Audio
Fosi Audio SK02
- 23 reviews
- Fosi Audio
$100.83
- Authorized Dealer · Tech Support · 30-Day Returns
Why it stands out
Best for
Not ideal for
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Setup guide
How to connect
What you should know
EMiUZEK buying notes
Frequently asked questions
View full technical specifications
Official product information provided by Fosi Audio
The following product descriptions, specifications and images are provided by the manufacturer.
Fosi Audio SK02 is a compact desktop USB and optical DAC/headphone amplifier with 3.5mm and 4.4mm headphone outputs.
An ES9038Q2M DAC, PCM 32-bit/384kHz and DSD256 decoding plus up to 755mW at 32Ω provide a capable all-in-one source for wired headphones and line-output systems.
Why it stands out
Hi-res desktop DAC
ES9038Q2M conversion supports PCM 384kHz and DSD256 over USB.
Dual headphone outputs
3.5mm single-ended and 4.4mm outputs support a wider range of headphone cables.
Strong 4.4mm drive
Up to 755mW at 32Ω provides useful power for many full-size headphones.
DAC, headphone amp and pre-out
The 3.5mm line output can feed powered speakers or an external amplifier.
Best for
- Desktop wired headphone systems
- PC and Mac high-resolution audio
- Users with 4.4mm headphone cables
- DAC/preamp use with powered speakers or an amplifier
Not ideal for
- Analog source input
- Bluetooth wireless playback
- Microphone or gaming-chat input
EMiUZEK Buying Notes
- SK02 accepts USB and optical digital inputs only; it has no analog input.
- The 4.4mm connection is for headphones; verify cable termination before use.
- Its 3.5mm output can operate as line out, while optical can also be passed out for a downstream DAC.
Frequently asked questions
Can I connect an analog source?
No. Inputs are USB and optical digital audio.
Does it support balanced headphones?
It provides a 4.4mm headphone output; use a correctly terminated compatible cable.
Can it feed powered speakers?
Yes. Use the 3.5mm line output.
Can it drive passive speakers?
No. Add a power amplifier.
What is the USB maximum?
PCM 32-bit/384kHz and DSD256 from compatible software and sources.
Can it output optical audio?
Yes. The shared optical connection supports optical output for compatible downstream equipment.
HOW TO CONNECT
Computer headphones
Source: PC or Mac
Connection: USB-C audio
Output: 3.5mm or 4.4mm headphone
Target: 16–300Ω headphones
Note: Select the correct gain and output mode.
TV headphones
Source: TV or console
Connection: Optical PCM
Output: Headphone output
Target: Wired headphones
Note: Set the source to PCM stereo.
Powered speakers
Source: Computer or optical source
Connection: USB or optical
Output: 3.5mm line out
Target: Powered speakers or amplifier
Note: Use line-out mode and manage system volume safely.
Technical Specifications
Audio performance
| Feature | Specification |
|---|---|
| DAC chip | ESS ES9038Q2M |
| USB maximum | PCM 32-bit / 384kHz; DSD256 |
| Optical maximum | 24-bit / 192kHz |
| Headphone impedance | 16–300Ω |
| 3.5mm output | 190mW at 32Ω |
| 4.4mm output | 755mW at 32Ω |
| THD | ≤0.001% at 1kHz |
Connections and physical
| Feature | Specification |
|---|---|
| Inputs | USB, optical |
| Outputs | 3.5mm headphone, 4.4mm headphone, 3.5mm line out / optical out |
| Frequency response | 20Hz–20kHz (±0.02dB) |
| Power | 5V USB-C |
| Dimensions | 121 × 51 × 43mm |
| Weight | 380g |
Recommended System Setup
| Setup | Connection |
|---|---|
| Computer headphones | Computer → USB → SK02 → Headphones |
| TV headphones | TV optical PCM → SK02 → Headphones |
| Powered speakers | Digital source → SK02 line out → Powered speakers |
Additional Product Content
Fosi Audio product comparison
Compare the models by the differences that most affect system matching and everyday use.
| Feature | SK02 | SK01 | Q4 |
|---|---|---|---|
| Product position | Hi-res desktop DAC/amp | Analog headphone amp/preamp | Entry DAC/amp with tone controls |
| DAC chip | ES9038Q2M | No DAC | 97220-based chipset |
| Main inputs | USB, optical | 3.5mm analog | USB, optical, coaxial |
| USB maximum | 32-bit / 384kHz, DSD256 | No USB audio | 24-bit / 96kHz |
| Headphone outputs | 3.5mm, 4.4mm | 3.5mm, 6.35mm | 3.5mm |
| Maximum output at 32Ω | 755mW via 4.4mm | 2400mW high gain | 100mW |
| Analog line output | 3.5mm | 3.5mm | RCA |
| Tone controls | No | Three-band | Bass and treble |
| Battery operation | No | Yes | No |
| Best use | Hi-res desktop headphones | Powerful analog amplification | Simple PC/TV audio |
What's in the box, manuals and downloads
Shipping, warranty and returns
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