AliexpressThe Fosi Audio SK02-Black is a standard SK02 desktop DAC and headphone amplifier for connecting compatible digital sources and headphones. It accepts USB and optical digital inputs, provides separate 3.5mm single-ended and 4.4mm balanced headphone outputs, and includes a rear 3.5mm AUX/OPT output. This listing is for the black model, not the orange-knob option.
Connections and controls
A large front control knob handles everyday volume adjustment, while dedicated buttons provide high/low gain and input-mode selection. USB-C supplies power. The front panel places both headphone outputs within reach, and the rear panel provides the digital input and line/output connections.
- USB and optical digital inputs
- 3.5mm single-ended headphone output
- 4.4mm balanced headphone output
- Rear 3.5mm AUX/OPT output
- USB-C 5V power input
- High/low gain and input-mode buttons
Specifications
| Item | Details |
|---|---|
| Model | Fosi Audio SK02 |
| Selected variant | SK02-Black |
| Device type | USB DAC and headphone amplifier |
| Digital inputs | USB and optical |
| Headphone outputs | 3.5mm single-ended and 4.4mm balanced |
| Rear output | 3.5mm AUX/OPT |
| Power | USB-C 5V |
| Box contents specified by manufacturer | SK02, 2-in-1 USB-A/C-to-C cable, manual |
Practical limitations
The SK02 is not a USB microphone or audio-recording interface, and it is not a passive-speaker power amplifier. A speaker system requires compatible powered speakers or a separate speaker amplifier. The product illustrations show additional equipment and do not establish that speakers, an amplifier, headphones, an optical cable, or a subwoofer are included. The illustrated speaker arrangement requires suitable external amplification and does not promise dedicated subwoofer management.
Use a properly wired balanced headphone cable with the 4.4mm output; a generic adapter from single-ended wiring is not a substitute. Start with low volume and gain. Phone and console use depends on the host device supporting the required connection, so compatibility should be checked before purchase.
Buyer checks
- Confirm that the listing is the black SK02-Black variant.
- Check whether your source offers compatible USB or optical output.
- Match your headphones and cable wiring to the chosen 3.5mm or 4.4mm output.
- For speakers, verify that you already have suitable powered speakers or a separate amplifier.
- Confirm the included cable and manual against the seller’s current package details.
US price and shipping snapshot
Price checked: October 19, 2026. The selected SK02-Black; standard SK02 DAC/headphone amp, no headphones or speaker amplifier option from Fosi Audio Official Store showed free ordinary shipping to the checked Cedar Lane, US destination, with estimated arrival October 27–November 3. These are live listing observations, not a completed checkout or delivery guarantee. Prices and availability vary with variant, seller, destination, account, promotion and time. Check applicable taxes and final charges before paying, and re-select this exact option if the affiliate link resets the variant.
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