89%
Fosi Audio Fosi Audio SK02 Desktop DAC Headphone Amplifier
- Compact Yet Powerful: The SK02 employs a minimalist and stylish design language. Despite its small size, it boasts mighty features. It supports DSD256 and PCM 32bit/384kHz high-resolution decoding, along with 3.5mm single-ended and 4.4mm balanced headphone outputs. Its robust power can easily drive a wide range of headphones and IEMs with an impedance range of 16-300 ohms.
- Stunning Performance: It features a high-end ESS SABRE ES9038Q2M DAC and SGM8262 op-amps. Its excellent circuit design ensures superior parameters with a SNR as high as 120dB, a low noise floor of only 3.7μV, and an incredibly low THD of 0.001%. The 4.4mm balanced output power reaches an impressive 1100mW at 32 ohms. The exceptional high-resolution capability and pure sound quality make every listening experience an extraordinary sensory journey.
- User-Friendly Design: The SK02 requires no drivers and offers plug-and-play convenience. It integrates a big multi-functional control knob, allowing easy access to power on/off, play/pause, and volume adjustments. The unit features quick-switch buttons for high/low gain and input modes. Additionally, its colorful indicator lights enable effortless identification of the current working mode and the song's sampling rate.
- Remarkable Versatility: Supports USB and optical input, widely applicable for decoding with computers, laptops, CD players, TVs, and projectors. Not only can it function as a headphone amplifier, but it can also serve as a preamp, pairing with active speakers or an amplifier like Fosi Audio V3, ZA3, TB10D amp, and passive speakers to form a desktop listening or home audio system.
- Exquisite and Durable: The SK02 is crafted from a single piece of aluminum alloy using CNC machining and a delicate sandblasting process. This not only gives it an exquisite appearance but also ensures lasting durability. In addition, Fosi Audio pledges to provide a 24-month worry-free warranty and responsive customer service to all users.
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Professional Reviews 89/100
Nicely Roasted
Sound Quality
86/100
Build Quality
88/100
Features Usability
93/100
Value for Money
95/100
Compact yet impressively capable, the SK02 delivers clean, resolving sound, controlled bass and a spacious, accurate image from a genuinely desk-friendly DAC/amp. Giz Audio praised its neutral-warm richness, while The Honest Audiophile highlighted its precise imaging and strong detail retrieval. USB/optical flexibility, balanced drive and standout sub-$100 value make it a compelling hub for IEMs and easy-to-drive headphones.
What Reviewers Are Saying
Pros
Clean, detailed and revealing presentation with strong resolution for the price.
Accurate, spacious imaging with convincing depth and layering suits music and positional gaming.
Excellent feature-to-price ratio, including USB-C and optical inputs, 3.5 mm and 4.4 mm headphone outputs, and robust build quality.
&
Cons
Its analytical, cool-leaning presentation can feel less engaging or somewhat sterile with the wrong headphone pairing.
Hard-to-drive 300-ohm headphones and demanding planars reach volume but may not perform at their full potential.
SOUND QUALITY PERFORMANCE 86/100
Reviews describe a clean, detailed and generally neutral presentation with strong bass control, useful punch and convincing spatial organization. Its upper treble can sound more energetic or aggressive than average, while direct evidence about background silence and performance across a wide range of headphone loads is limited.
Transparency Resolution
91/100
The Honest Audiophile found the SK02 refined, focused and highly capable of resolving information, while AV Atmos praised its clarity and detail as exceptional. Giz Audio also found its technical performance better than expected at the price, although noting that the Fiio K7 and D12 retrieved a little more detail.
Tonal Balance Musicality
87/100
Reviewers broadly hear a neutral, revealing balance, though Giz Audio hears a slight low-mid warmth that adds richness and avoids thinness. PortaFi praises good harmonic saturation and an airy presentation, but also flags a more energetic, somewhat aggressive upper-frequency character that may not suit every pairing.
Dynamics
88/100
AV Atmos reports authoritative bass and clean control during demanding action scenes, while The Honest Audiophile hears convincing punch and slam when the recording calls for it. PortaFi similarly describes good micro-contrast and says the amplifier follows a recording's dynamics rather than adding its own emphasis.
Noise Floor
80/100
The supplied reviews do not specifically address hiss, hum or background silence with sensitive earphones. One reviewer reports a clean tone at very high listening levels, but that is not enough to establish sensitive-IEM performance.
Headphone Compatibility
85/100
Reviewers found the available power sufficient for most use cases, with Audio Masterclass able to reach far louder than comfortable levels while retaining a clean tone. The 4.4 mm balanced output is quoted at 1,100 mW and the single-ended output at 280 mW, but the reviews offer little direct comparison across demanding planars, high-impedance headphones and sensitive IEMs.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
88/100
Giz Audio calls the compact chassis fairly well built and robust, and The Honest Audiophile describes it as very well built. PortaFi notes a metal construction with some reassuring weight, while reviewers also report stable connections and properly functioning buttons.
Features Usability
93/100
This compact DAC/amp combines USB-C and optical inputs, 3.5 mm single-ended and 4.4 mm balanced headphone outputs, plus a 3.5 mm line output that can also operate as an optical output. Reviewers praise the simple volume control, stable operation, sample-rate display and DSD support; it is externally powered rather than battery-operated.
Value for Money
95/100
At $99.99, Giz Audio calls the combination of sound, power, features and build quality an easy recommendation and says the value is clearly there. AV Atmos recommends it to buyers seeking a sub-$100 DAC/amp solution, while PortaFi also judges its price-to-quality relationship very favorably.
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Authorized dealers for Fosi Audio Fosi Audio SK02 Desktop DAC Headphone Amplifier
- Acoustic Technologies — online and in-store — Montréal, Québec, Canada (website)
- Altitudo Audio — online and in-store — Winnipeg, Manitoba, Canada (website)
- Apos Audio — online and in-store — Oakland, California, United States (website)
- Audeos — online and in-store — Żywiec, Województwo śląskie (website)
- Audio 46 — online and in-store — New York, New York, United States (website)
- Audio Domain — online and in-store — Stadtbezirke I, Nordrhein-Westfalen, Germany (website)
- Audio Magic - EU — online and in-store — Wola, Województwo mazowieckie, Poland (website)
- AUDIOPHONICS — in-store — Bordeaux, Nouvelle-Aquitaine, France (website)
- AV Cables — online and in-store — Hornsyld, Denmark (website)
- B&H Photo — online and in-store — New York, New York, United States (website)
and 13 more verified dealers