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Fosi Audio SK01 Headphone Amplifier Equalizer Preamp with Bass Midrange Treble Tone Control and Loudness Compensation Portable Class A Analog Amp for Electric Guitar Instrument with 3.5mm 6.35mm Jacks
Sustainability features
Purchase options and add-ons
| Brand | Fosi Audio |
| Colour | Black |
| Compatible devices | Musical Instruments with 6.35mm or 3.5 Jack Connectors |
| Material | Aluminum Alloy |
| Output wattage | 2400 Watts |
| Product Dimensions | 12.1D x 5.1W x 4.3H Centimetres |
| Model name | SK01 |
| Number of bands | 3 |
| Power source | Battery Powered |
| Output channel quantity | 2 |
About this item
- Combo Design: Whether as a powerful headphone amp, a customizable analog preamp, or an acoustic equalizer for the instrument, it effortlessly elevates your listening experience, delivering exceptional sound quality and personalized sound signatures
- Tri-Band Control: By enabling adjustments for treble, midrange, and bass, in conjunction with central detents for tone-defeating, achieving the ideal equilibrium becomes effortless. Up to 2400mW power is available in high impedance mode
- Diverse Capabilities: Instantly restore original sound with the one-click tone- defeating button; Immerse yourself in music during the quiet hours using the loudness function; Tailor the gain level to accommodate headphones with various impedances through the gain level switch
- Superb Finishing: The aluminum alloy body showcases meticulous attention to details. Built-in 2500mAh battery, up to 6 hours of battery life. It offers versatile connectivity through the 3.5mm & 6.35mm headphone jacks (32-300 ohms), serving as both a portable and desktop headphone amplifier
- What You'll Get: Fosi Audio SK01 Headphone Amp x1, User Manual x1, 2-in-1 USB Type-A/C to Type-C Cable x1
Frequently bought together

Product information
Technical Details
| Brand | Fosi Audio |
|---|---|
| Manufacturer | Fosi Audio |
| Model | SK01 |
| Model Name | SK01 |
| Part Number | SK01-Fosi-EU |
| Compatible Devices | Musical Instruments with 6.35mm or 3.5 Jack Connectors |
| Amplifier Type | Solid State |
| Mounting Hardware | Fosi Audio SK01 |
| Output Wattage | 2400 Watts |
| Power source type | Battery Powered |
| Batteries included | No |
| Batteries Required | No |
| Speaker Output Channel Quantity | 2 |
| Connector Type | auxiliary, usb |
| Material Type | Aluminum Alloy |
| Does it contain liquid? | No |
| Includes rechargable battery | No |
| Includes Remote | No |
| Manufacturer | Fosi Audio |
| Item model number | SK01 |
| Product Dimensions | 12.09 x 5.08 x 4.29 cm; 430 g |
| ASIN | B0CF1WL1V2 |
Additional Information
| Date First Available | Sept. 23 2023 |
|---|---|
| Customer Reviews |
4.4 out of 5 stars |
Feedback
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Sustainability features
This product has features recognized as more sustainable by certifying organizations.
Carbon emissions from the lifecycle of this product were measured, reduced and offset.
From the brand
Amplifying Your Voice, Shaping Our Innovation
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Guided by our mission of "Redefining HiFi with Unmatched Value", Fosi Audio continues to fuel its passion for the Hifi industry, ramp up R&D efforts, and co-create new HiFi equipment with users. We pledge to bring more amazing Hifi gear with high value for the price, innovative design, cutting-edge technology, and premium quality, to audiophiles worldwide.
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Product Description
Fosi Audio SK01 Headphone Amplifier/Preamp
A multi-functional audio gear for desktop and portable music playing and tone tuning.
Tailor the Sound to Your Preference
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.
- Input: 3.5mm line in
- Output: 3.5mm line out, 3.5mm/6.35mm headphone jack
- Max Power Output: RMS 2400mW@32¦¸
- Terminating Impedance: 16-300¦¸
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Tri-Band Adjustment for Personality
Tailor the treble, middle, and bass with the knobs to find the perfect balance.
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Loudness Function for More Pleasure
Activate it to get a more balanced listening experience at lower volume levels.
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Two Gain Modes to Adapt Your Headphones
Achieve the best performance by selecting the right gain level to fit different impedance.
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Compatible with 3.5mm/6.35mm Headphones
Maximum 2400mW power to drive your 32-300¦¸ single-ended headphones with extraordinary performance.
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As a Headphone Amp
Drives any of your headphones easily and enrich the listening experience.
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As an Analog Preamp
Modifies the characteristic to get your beloved sound.
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As an Equalizer
Delivers accurate sonic detail for acoustic instruments.
6-Hour Battery Life
With a built-in high-capacity battery and isolated power design to reject interference, it ensures a pure listening experience without break off.
Aluminum Alloy Body
The full-metal body is exquisitely crafted, both in appearance and touch, adding a touch of elegance to your desktop.
Comparison Chart
Headphone Amp/Preamp | Type | Headphone Amp/Preamp |
2400mW@32¦¸-High Gain | MAX Power Output | 3.5mm: 280mW@32¦¸ |
3.5mm line in | Input | USB + Optical |
3.5mm line out | Output | Headphone, AUX/OPT |
? | Treble& Bass Control | x |
<0.001% | THD | ¡Ü0.001% |
¡Ý108»åµþ | SNR | ¡Ý120»åµþ |
Headphone Amp/Preamp | Type | Headphone Amp |
2400mW@32¦¸-High Gain | MAX Power Output | 310³¾°Â°ª32¦¸ |
3.5mm line in | Input | 3.5mm AUX |
3.5mm line out | Output | 3.5mm Headphone ¡Á5 |
? | Treble& Bass Control | x |
<0.001% | THD | ¡Ü0.001% |
¡Ý108»åµþ | SNR | ¡Ý105»åµþ |
Headphone Amp/Preamp | Type | Headphone Amp |
2400mW@32¦¸-High Gain | MAX Power Output | 40mW@100 Ohm |
3.5mm line in | Input | 3.5mm AUX |
3.5mm line out | Output | 3.5mm Headphone |
? | Treble& Bass Control | x |
<0.001% | THD | - |
¡Ý108»åµþ | SNR | - |
Headphone Amp/Preamp | Type | Headphone Amp+Preamp |
2400mW@32¦¸-High Gain | MAX Power Output | - |
3.5mm line in | Input | Bluetooth + RCA |
3.5mm line out | Output | RCA+3.5mm Headphone |
? | Treble& Bass Control | ? |
<0.001% | THD | ¡Ü 0.02% |
¡Ý108»åµþ | SNR | ¡Ý103»åµþ |


















