Fosi AudioFosi AudioFosi Audio

Fosi Audio V3 300W x2 2.0 Channel Hi-Fi Stereo Audio Amplifier with TPA3255 Chip


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✈️ Free Shipping 🗳️24 Months Warranty

TPA3255|300watts x2@4Ω|Hi-End Capacitors & Inductor


1. Innovative Case Cooling System

2. Replaceable Op-Amp Chips: SS3602, MUSES02, OPA2604AP, OPA2134PA

3. Speaker Output + Pre-out  

4. Logarithmic Taper A Pot

5. Replaceable Knobs: ORANGE KNOB

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Model: Black+32V

  • Black+32V
  • Black+48V
  • Orange Knob
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  • 300 Watts x2 Power Output: Fosi Audio V3 is a mini HiFi class-D power amplifier that delivers a maximum power output of 600W into two channels, ensuring a powerful and high-fidelity audio experience.

  • Innovative Cooling System Design: Fosi Audio has made significant breakthroughs in the thermal design of the V3 amplifier. There are vents on the top and bottom of the case, and the chip heatsink is attached to the case to realize the whole-body heatsink design, enhancing air circulation and heat dissipation. Its special design allows for extended usage without compromising performance or causing any detrimental effects.

  • Hi-End Sound Quality: With Texas Instruments' TPA3255 Class-D power amplifier chip,the V3 amplifier achieves exceptional power efficiency. With audiophile-grade materials, such as Sumida professional audio inductors, NCC high-capacity filter capacitors, German WIMA Output Capacitors, Japanese ELNA Capacitors, etc. Those high-quality components allow V3 to maintain very high stability even under high-power working conditions. With the V3, you can truly have an almost distortion-free music playback experience.

  • Enjoy Linear Volume Control: Built-in logarithmic Taper A Pot, the V3 amplifier is specifically crafted to meet the demands of audiophiles, Manage the audio volume in a much finer way suitable for human ear, providing an immersive and pure sound enjoyment. 

  • Customizable Sound Signature: The V3 amplifier features replaceable op-amp chips, there're two plug-ins NE5532 Op-Amps can be replaced by MUSES02, OPA2604AP, OPA2134PA Op-Amps etc.enabling users to experiment and achieve their preferred sound signature by swapping different op-amp chips.

  • Compact and Versatile: Despite its compact size, the V3 amplifier has the capability to drive passive speakers effectively, making it a versatile choice to turntable amplifiers, CD player, and DVD for creating a complete HiFi system.

  • What you Get: V3 Power Amplifier x1, Power Adapter x1 (The plug of the power adapter will match the country of your delivery address), User Manual x1, our worry-free 24-month warranty, and friendly customer service.

Fosi Audio V3


Specifications Details
Model V3
Chip Set TI TPA3255
Output Power 300Wx2 @4Ω
Terminating Impedance 2-8Ω
Input Mode RCA
Output Mode Speaker Output + Pre-out
Frequency Range 20Hz-20kHz(±0.1dB)
THD 0.003%
SNR ≥110dB
Control Knob Built-in Logarithmic Taper A pot
Device Dimension 6.5x4.1x1.4 inches
DC Input Range 24-48V
Power Supply 32V/5A, 48V/5A

Tips: The plug of the power adapter will match the country of your delivery address.

What‘s in the box?

Item Quantity
V3 Power Amplifier x 1
32V/5A or 48V/5A Power Adapter x 1
User’s Manual x 1

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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 V3 300W x2 2.0 Channel Hi-Fi Stereo Audio Amplifier with TPA3255 Chip