87%
Fosi Audio Fosi Audio SK01 Headphone Amplifier Preamp
- With treble, middle, and bass adjustments capabilities, combined with central point positioning, you can easily find the perfect balance. Additionally, you can effortlessly defeat all the tone adjustments with just a click on the PURE button.
Unmatched Headphone Compatibility: Experience versatile connectivity with the Fosi Audio SK01 Headphone Amplifier Preamplifier 2 in 1. Its input features a 3.5mm line in, while the output offers a 3.5mm line out, along with a 3.5mm/6.35mm headphone jack. Enjoy powerful performance with a max power output of RMS 2400mW@32Ω, catering to terminating impedance between 16-300Ω. Elevate your audio experience with seamless connectivity and exceptional power, all in one compact device.
Tailor-Made Audio Experience: The SK01 is a multi-functional audio gear that caters to desktop and portable music playing and tone tuning. The tri-band adjustment allows you to personalize treble, middle, and bass, finding the perfect balance for your preferences.
Multi-functional experience: Whether as a powerful headphone amp, a customizable analog preamp, or an accurate equalizer, it effortlessly elevates your listening experience, delivering exceptional sound quality and personalized sound signatures.
Long-Lasting Battery: Enjoy up to 6 hours of continuous usage with the built-in high-capacity battery, while the isolated power design rejects interference, providing a pure listening experience without any interruptions.
- Exquisite Design: Crafted with an aluminum alloy body, the SK01 is both elegant in appearance and touch, adding a touch of sophistication to your desktop setup.
What you Get: Fosi Audio Sk01 Headphone Amp x1, User Manual x1,2-in-1 USB Type-A/C to Type-C Cable x1, an 24-month worry-free warranty and friendly customer service.
WATT RECOMMENDS
Save your favorites. Compare them anytime.
Create a free HiFi Hub account to save products to your Wishlist and compare your favorites side by side.
Professional Reviews 87/100
Nicely Roasted
Sound Quality
85/100
Build Quality
88/100
Features Usability
86/100
Value for Money
93/100
The SK01 brings serious headphone drive and hands-on analog tone shaping to a compact budget amp. PortaFi found it especially lively with higher-impedance full-size headphones, while its bass, mid and treble controls, loudness mode and preamp output make tailoring a system unusually easy. A robust, versatile little powerhouse for listeners who value musical flexibility.
What Reviewers Are Saying
Pros
Delivers convincing power and dynamics with full-size and higher-impedance headphones, including 300-ohm models.
Three-band analog tone controls, tone defeat and loudness provide genuinely useful sound tailoring without an obvious loss of quality at flat settings.
Robust alloy construction, smooth controls and low channel imbalance impress for the price.
&
Cons
Resolution and detail retrieval are competent rather than class-leading, with some sub-$100 rivals sounding more transparent.
Sensitive IEMs can reveal background noise, particularly on high gain.
The default presentation can sound lean, with limited bass weight and note density.
SOUND QUALITY PERFORMANCE 85/100
The SK01 is described as a clean, neutral-to-lean amplifier with useful power and an unusually flexible analog tone-control section. Reviewers praise its ability to energize full-size headphones, while noting that outright detail retrieval is merely competent rather than a standout.
Transparency Resolution
82/100
PortaFi finds resolution decent and reports good control, while its Ukrainian review calls the presentation reasonably resolving for the money. Giz Audio is less enthusiastic, describing detail as slightly below average and finding competing products more transparent and resolving.
Tonal Balance Musicality
84/100
In its default configuration, reviewers describe the sound as neutral and fairly linear, though Giz Audio hears a leaner presentation with limited note weight. Vocals and instruments remain natural enough to avoid distraction, and the bass, mid and treble controls offer useful scope to tailor the presentation without an obvious quality penalty.
Dynamics
90/100
Its power delivery is a clear strength: Giz Audio calls the output impressive at the price and expects it to drive most headphones without issue. PortaFi specifically reports strong results with full-size headphones, including 300-ohm models, saying it adds dynamics and emotional engagement.
Noise Floor
82/100
PortaFi characterizes the amplifier as not especially hissy, which is encouraging for general headphone use. The reviews provide little direct testing with highly sensitive IEMs, so its behavior with the most noise-revealing earphones is less clear.
Headphone Compatibility
87/100
Two gain positions, 3.5 mm and 6.35 mm headphone outputs, and substantial high-gain output make the SK01 adaptable for a wide range of conventional headphones. Reviewers particularly highlight convincing drive with full-size 40-ohm-and-up headphones and 300-ohm models, although there is limited evidence on sensitive IEM pairings.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
88/100
Reviewers describe the alloy body as robust, with tight potentiometers and buttons. PortaFi also reports smoothly rotating controls and almost no channel imbalance, supporting a notably polished feel for an affordable unit.
Features Usability
86/100
The compact SK01 combines 3.5 mm line input and line output with both 3.5 mm and 6.35 mm headphone sockets, plus two gain settings. Its three-band analog tone controls, tone-defeat option and loudness function make it considerably more adaptable than a conventional minimalist analog amplifier, though it has no DAC or digital audio inputs.
Value for Money
93/100
At around $79.99, Giz Audio calls the SK01 very affordable and especially impressive for power output. PortaFi considers the price fair and describes it as a very good device for its asking price, particularly as a compact headphone amplifier, preamp and tone-control unit.
Reviews
Online Reviews & Mentions
YouTube Reviews
Forum Mentions
No forum mentions found yet
Verified Dealers
Online Dealers
All Dealers
Zoom out the map to see more dealers
Authorized dealers for Fosi Audio Fosi Audio SK01 Headphone Amplifier Preamp
- 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