Fosi AudioFosi AudioFosi Audio

Fosi Audio SK01 Headphone Amplifier & Preamplifier


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✈️ Free Shipping 🗳️24 Months Warranty

Get $8 Off with Code: SK018
Versatile Audio Gear|Headphone Amp |Pre-Amplifier |Equalizer


1. Tri-Band Tone Control

2. By a Button Defeat Tone

3. Single-Ended 3.5mm & 6.35mm Supported 

4. Bass & Treble Control with Midpoint Positioning  

5. Incorporates High & Low Two Gain Levels 

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  • 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.



Specifications Details
Model SK01
Input 3.5MM line in
Output 3.5mm Headphone, 6.35mm Headphone, 3.5MM line out
Amp output maximum power High Gain: RMS 2400mw/ 32Ω,Low Gain: RMS 300mw/32Ω
Frequency Range 20Hz-20kHz (±0.5dB)
THD+N 0.001% @ 1kHz and 770mV
SNR ≥108dB
Headphone matching impedance 16-300Ω
Device Dimension 4.76*2*1.69inch (121*51*43mm)
Net Weight 0.641b/290g
Power Supply 5V, USB Type-C

What‘s in the box?

Item Quantity Fosi Audio Sk01 Headphone Amp x 1, 2-in-1 USB-A/C to C Cable x 1, User’s Manual x 1

SK01 User Manual


Worldwide Shipping

We can ship to any country or region in the world. Shipping is free worldwide, except for special regions/countries where we are unable to offer shipping, such as Ukraine.

1. Overseas warehouse delivery
2. China(Shenzhen) delivery

1. Overseas warehouse delivery

Overseas warehouse deliveryUnited States, Canada, United Kingdom, Germany, France, Italy, Netherlands, Portugal, Spain, Sweden and Hong Kong, Macau, Taiwan in China are free shipping for you.

Order processing time: All orders require 1 business day for preparation and packaging, excluding Saturdays and Sundays. Holidays will be extended according to China's legal time.

Pre-order products: The shipping date is based on the specific product labeling.

After shipment, you can track your order. To track your order, please click here.


Shipping Method

Standard Shipping (Free

Fast Shipping ($25)

United States


1-5 days



Canada Post

3-5 days


United Kingdom

Royal Mail

3-5 days


Germany, France, Italy, 

Netherlands, Portugal, 

Spain, Sweden

Other Shipping 

3-7 days


Hong Kong, Macau, Taiwan


3-10 days


Other countries

Other Shipping 

3-10 days



Note: If there is a stock shortage in the overseas warehouse, the delivery time may be extended by 5-15 days. We will contact you via email, and you can also inquire with our customer service regarding the delivery status. 

2. China(Shenzhen), shipping worldwide via 4px.

Order processing time: All orders require 1 business day for preparation and packaging, excluding Saturdays and Sundays. Holidays will be extended according to China's legal time.

Pre-order products: The shipping date is based on the specific product labeling.

After shipment, you can track your order. To track your order, please click here.


 Shipping Method 

 Standard Shipping (Free

 Fast Shipping ($25)


Other Shipping 

5-15 days

3-7 days


Note: If there is a stock shortage in the China warehouse, the delivery time maybe extended by 5-15 days.
We will contact you via email, and you can also inquire with our customer service regarding the delivery status.

Not all products have stock in other warehouses. If you require urgent delivery from another warehouse, please confirm with us first. 
If your order does not display any shipping time, it is usually because you have purchased multiple products, each from a different warehouse, resulting in the inability to display the normal shipping time. It will default to 5-15 days. 
If you have any questions, please feel free to contact us.


European Union (EU) Countries:

For shipments from the China warehouse to EU countries: 

The final price you see on the official website includes taxes.This way, you don't have to pay the taxes yourself, saving you time and effort.
However, if you prefer, you can choose to pay the taxes yourself, and we will refund the taxes paid through our platform.

For shipments from overseas warehouses to EU countriesNo taxes will be charged.

Other Countries:

The final price you see on the official website does not include taxes. Imported goods/services may be subject to taxes and are governed by local country/region laws. We do not collect any taxes or value-added taxes, nor do we assume any tax liability. 
If you have specific requirements, please contact us.

Most goods are not subject to import taxes when shipped from warehouses in the United States, the European Union, or Russia to their respective countries.

For countries with complex customs procedures, such as South America, we recommend ordering through AliExpress or finding a recipient in North America to assist with the shipment.


Note: Remote addresses may experience longer delivery times and incur additional costs.

✓ 30 Days Free Return

At Fosi Audio, we always strive for the highest customer satisfaction. If you are dissatisfied with the product or if it has any defects, you can request a return or refund.

Within 30 days of purchase, for any reason whatsoever, undamaged products can be returned for a full refund. Once the returned items are inspected upon arrival at our warehouse, the refund process will be initiated.

Items must be in their original packaging. For non-quality related return requests, the buyer is responsible for the return shipping costs. Returns that do not meet the above requirements may be rejected.

We cover return shipping costs for the following situations:

  1. Defective parts.
  2. Damaged equipment.
  3. Incorrectly shipped items.

The 30-day period starts from the day you receive the item.

*If your order exceeds the 30-day free return period and it is still unopened, you may still apply for a return. However, you will need to bear the return shipping costs, and a 15% restocking fee will be charged. (This situation only applies to products purchased from


How can I initiate a return?

  1. Please contact Fosi Audio customer support to initiate the return. Explain the reason for the return and provide the invoice or screen capture to confirm the order number.
    customer support email:
    Phone: 00852-67645515
  2. Fosi Audio customer support will provide you with the return address within 1-2 days.
  3. To expedite the refund process, make sure to send the return notification to Fosi Audio customer support with the following information:
  • tracking number
  • shipping receipt (If shipping fee refund needed)
  • PayPal account (If shipping fee refund needed)

How long will it take to receive the refund?

Once the returned items reach our warehouse, we will promptly process the refund. The refund will be made using the same method as your original payment. The processing time usually takes 3-5 business days.


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Fosi Audio SK01 Headphone Amplifier & Preamplifier