Fosi Audio PH04 Headphone Amplifier 4 Channel Metal Stereo Audio Amp Ultra-Compact Portable Headphone Splitter

Share a Single Stereo Source: 4 channel amplifier features 4 independent stereo high-power amplifier sections with separate volume knobs for each of up to four outputs, which makes it possible for up to four people...
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Overseas warehouse shipping 3-5 days, China warehouse shipping 7-15 days.
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  • Share a Single Stereo Source: 4 channel amplifier features 4 independent stereo high-power amplifier sections with separate volume knobs for each of up to four outputs, which makes it possible for up to four people to monitor the mix for tracking, live uses and listen to the TV with earbuds while working out.

  • For Studio and Stage Applications or more: Such an ultra-compact and portable design makes it very suitable for the studio or stage where multiple headphones are used at the same time.

  • Fantastic Stereo Quality: It is a mini headphone amplifier with 3.5mm (not 6.35mm)input/output that contributes to the smoother connection of output and input, suitable for virtually all types of headphones, creating the highest Stereo audio Quality and eliminating the need for a 6.35 to 3.5mm adapter to connect the headphone power amplifier to the headphone.

  • Unique Compact design with switch: It is convenient for you to turn on/off the compact headphone power amplifier with a power switch anytime and anywhere, saving energy when enjoying high stereo audio quality.

  • What You G: Ultra low noise headphone amplifier*1,12V DC power adapter *1, Use manul*1, 18 Months Warranty for Fosi Audio Headphone amplifier. Please contact us at any time if you have any problems.

Fosi Audio PH04 Headphone Amplifier 4 -Channel Metal Stereo Audio Amp Ultra-Compact Portable Headphone Splitter for Studio
Fosi Audio PH04 Headphone Amplifier 4 -Channel Metal Stereo Audio Amp Ultra-Compact Portable Headphone Splitter for Studio


Specifications Details
Model PH04
Input Mode 1/8'' headphone, stereo
Output Mode 1/8'' headphone, stereo
Input Impedance 100 Ω
Output Impedance 80 Ω
Max. Input level +15dBu
Max. Output level 40mW in 100 Ω
Device Dimension 103 x 57 x 43MM (4.06 x 2.24 x 1.69’’) includes knobs
Device Weight 175g
Power Supply 12V 1.5A

What‘s in the box?

Item Quantity
Fosi Audio PH04 x 1
12V 1.5A Power Adapter x 1
User’s Manual x 1


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 delivery: United 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.
United States, Canada, United Kingdom: 3-5 days.
Germany, France, Italy, Netherlands, Portugal, Spain, Sweden: 3-7 days.
Other countries: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.
Ships from China warehouse, standard shipping usually takes 5-15 days, fast shipping takes 3-7 days ($25 shipping fee applies)

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.

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.

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.