Fosi Audio ZA3 Balanced Stereo Amplifier Home Audio 2CH Mono Amp with TPA3255 Chip

Thank you for your enthusiastic interest in the Fosi Audio ZA3! The first limited batch of 2000 units in our pre-sale has been completely sold out, and we sincerely appreciate your support in making this...
Model: 32V Power Supply
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Overseas warehouse shipping 3-5 days, China warehouse shipping 7-15 days.
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  • Thank you for your enthusiastic interest in the Fosi Audio ZA3! The first limited batch of 2000 units in our pre-sale has been completely sold out, and we sincerely appreciate your support in making this moment so special.

    For those who missed out on the first pre-sale, we are introducing the second batch with a 90-day pre-order application plan, providing you with more opportunities to experience the powerful charm of the ZA3.

  • Here are the details:

    The second pre-order period: January 10th, 6:00 PM to April 10th (Pacific Time)

    Available Quantity: 5000 units

    Shipping Date: Starting from March 1, 2024, we will gradually ship based on the order time sequence, ensuring completion by April 10th at the latest.

    Refund Policy: During the pre-sale period, you can cancel your order and receive a full refund.

    The restocking plan for ZA3 on sales platforms is as follows:

    January 30th: Available on Fosi Audio's official stores on AliExpress and eBay, with limited quantities, so grab yours quickly!

    End of February: Available on Fosi Audio's official store on Amazon, with limited quantities, so be sure to grab yours promptly!

    End of April: Fully available on all platforms with sufficient stock.

    For the first batch of pre-ordered 2000 units of ZA3, we have also prepared detailed shipping arrangements:

    Order Time: From 3:00 PM on December 22nd to 4:00 PM on January 10th (Pacific Time)

    Shipping Date: Starting from January 28, 2024, we will ship in sequence based on the pre-order time. Due to the large number of orders, the shipping preparation time may take 1-2 days.

    Estimated Arrival Time: As ZA3 is shipped from our warehouse in China, the estimated shipping time is 7-15 days, with some remote areas or countries taking 15-25 days. If you choose fast shipping, you can expect it to arrive within 5-10 days.

  • Dual-Mode Innovation: This new generation mini amplifier offers both stereo and mono modes, and adapts flexibly to your diverse needs, allowing seamless mode switching. In stereo mode, it delivers a robust output of up to 155W, while in mono mode, the power soars to a maximum of 235W. Pair two ZA3 units in mono configuration to create a powerful audio system, significantly enhancing your listening experience.

  • Richer Connectivity: Debut amplifier with balanced input and trigger in, the ZA3 features a balanced combo audio signal input connector supporting both XLR and 1/4" TRS plugs. This design minimizes interference and reduces noise floor. The 12V trigger-in connector enables synchronization with other devices, streamlining the process of turning on/off without individual operations.

  • Audiophile-Grade Components: The ZA3 features the TPA3255 high-end Class-D amp chip and utilizes premium Japanese NCC, ELNA, and German WIMA capacitors, and Japanese Sumida inductors for exceptional audio quality. With a SINAD rating of up to 89dB, an SNR of up to 106dB, and a low noise floor of only 150μV, it delivers exceptional clarity and low distortion.

  • Advanced Heat Dissipation: Based on V3's groundbreaking heat dissipation design, we upgraded ZA3's cooling system by featuring a larger chassis, moving vents to the sides, and adding dust covers to achieve better ventilation for a sustained and stable high power output.

  • Enhanced Scalable Fun: Personalize your audio experience with the op-amp rolling feature! The ZA3 stocks five swappable op-amps for left and right channel outputs, balanced input, and subwoofer output. Experiment with compatible DIP8 dual op-amps such as Sparkos SS3602, MUSES02, OPA2134PA, OP249, AD827, RM4558, LM4562, LME49720HA, etc. to fine-tune your sound to perfection.

  • What you Get: ZA3 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 ZA3

PBTL Mono Mode SupportFlawless XLR Balanced Input SupportZA3-Heat Dissipation DesignTPA3255-ZA3ZA3- Power Supply


Specifications Details
Model ZA3
Chip Set Texas Instruments TPA3255
Output Power With 48V/5A PSU
Stereo: 155Wx2 @4Ω
Mono: 235Wx1 @4ΩWith
With 32V/5A PSU
Stereo: 95Wx2 @4Ω
Mono: 110Wx1 @4Ω
Terminating Impedance 2-8Ω
Input Mode RCA, XLR, 1/4" TRS
Output Mode Speaker Output (supports banana plug or bare wire connection), Active Subwoofer Output
Frequency Range 20Hz - 20KHz(±0.1dB)
THD <0.006%
SNR ≥106dB
Dynamic Range ≥106dB
Device Dimension 15.49 x 18.39 x 5.08 cm; 1.78 Kilograms
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.

Please use a 3.5mm stereo trigger cable for the trigger input on the ZA3, it must be noted that it takes several seconds for the trigger to activate the ZA3.

What‘s in the box?

Item Quantity
ZA3 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 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.

Customer Reviews

Based on 68 reviews
Allen Lopez
Mighty mouse size Godzilla sound

Was expecting decent but got a surprise. Good solid base from my Mission cyrus 781 speakers. Mids are smooth and image nicely. Highs are crisp and open. Overall this is a steal of an amp. Using the balanced inputs really make a significant improvement . Volume levels are loud enough before noticable distortion or clipping. Down the line will get a second one for dual mono mode. I like this amp.

Atli Hauksson

All as expected - thanks

Elliott Potter
Nice overall

This is a really nice amp. It has a nice clean look and sound quality is pretty good. I have it connected to a pre-amp using RCA connections and when I turn the amp on, there's a quiet high-pitched whine that changes in pitch if the pre-amp is on or off, but never goes away. It's quiet enough to get lost in the background when you're listening to music, but is clearly evident when nothing is playing.
I had to read the manual to figure out how to turn on the amplifier, which seems like a minus. A dedicated power button would have detracted from the symmetry of the front panel but I think I'd rather have that anyway.

Han JongHun
Good good good

Thanks for good items.

Francisco Montilla
Liked Fosi Za3

My very first amplifier so I liked it a lot

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