Fosi Audio BT20A Bluetooth 5.0 Amplifier 2 Channel Stereo Amp Receiver Class D Amplifier for Home Audio System

100W X 2(4 ohms, 20 Hz - 20 kHz, 0.04% THD), comes with a 24V power supply. If your usage scenario is smaller, it can also drive larger speakers, such as those rated at 280...
MODEL: Black
Guaranteed safe checkout:
American Express
Apple Pay
Diners Club
Overseas warehouse shipping 3-5 days, China warehouse shipping 7-15 days.
Hoorey ! Our shipping is free!
  • 100W X 2(4 ohms, 20 Hz - 20 kHz, 0.04% THD), comes with a 24V power supply. If your usage scenario is smaller, it can also drive larger speakers, such as those rated at 280 watts (8 ohms) and 320 watts (4 ohms). Please note that this is applicable only for passive speakers.

  • Advanced circuitry design, built-in speakers protection circuit, best for bookshelf/computer/desktop/speakers in your home;

  • Home integrated digital amplifier, 24-month warranty, you can return the item if you have any problems;

  • Small simple compact design but practical and powerful, Hi-Fi Bluetooth amplifier exclusively designed for the customers who pursue HiFi sound;

  • Bluetooth 5.0 core, up to 33ft connection range guarantees low signal delay. No pop, no audible noise when Bluetooth connection is established;

Fosi Audio BT20A Bluetooth 5.0 Amplifier
Fosi Audio BT20A Bluetooth 5.0 Amplifier 2 CH


Specifications Details
Power supply range 12v-24v
THD ≤ 0.5%
Frequency Range 20Hz - 50kHz (±2 dB)
SNR ≥ 98dB
Input sensitivity ≤ 280mV
Bluetooth transmission distance 28ft
Terminating impedance 2Ohm - 8Ohm
Output power 100W + 100W
Input mode Bluetooth and Analog
Bluetooth Name Fosi Audio
Bluetooth chip ATS2853
Power supply 24V 4.5A

What‘s in the box?

Item Quantity
Amplifier 1
Power supply 1
AC power cord 1
User’s Manual 1

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


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 6 reviews
J Frazier
Works great!

Paired with Google Nest Mini to drive Norman Lab 8 passive floor speakers. (Didn't need ChromeAudio or other expensive device.) Appreciate the Bass & Treble controls. Now I can play my nice speakers along with Google Nest speakers in other parts of the house.

generally satisfied

Thank you very much for asking about my satisfaction. Overall I am very pleased. It gives a very clear sound. However, I wonder if the bass could have been stronger. My speakers belong to the Sony FH-B70CD model mini stereo that I bought in the 1990s. (2x30W rms) The stereo was in working order but was taking up a lot of space. Additionally, the aux input gave lower quality sound than the CD player. I thought maybe I could make up for this with the Fosi Audio BT20A. It's better, but still not as good as the Sony FH-B70CD CD player.

John J. Bobelak
Pocket full of Dynamite

Impressed with the performance and sound quality from such a small audio box. Bluetooth range is impressive as well. I carry my phone in my pocket while connected to the Fosi Bluetooth amp and walk around my garage and driveway and signal is strong and stays connected. Very happy with this solution connected to Bose 251 outdoor speakers that I have had for many years, and they never sounded better.

Robert Edwards

Like Mathias, I bought this because I wanted to upgrade from small powered computer speakers for the PC I use to transfer music on. I had a pair of Klipsch KB 1.1 passive speakers laying around and put them together with the BT20A-S I bought. Perfect! I don't know how else to explain it.

Mathias Freeman
Great little unit

This thing is great. I had a set of passive bookshelf speakers laying around and wanted to use them with my pc. No problem with this thing. I was able to do everything I wanted to do. Room correction via windows, adjust EQ and make the music loud

Related product
Fosi Audio V3 300W x2 2.0 Channel Hi-Fi Stereo Audio Amplifier with TPA3255 Chip Fosi Audio V3 300W x2 2.0 Channel Hi-Fi Stereo Audio Amplifier with TPA3255 Chip
$79.99 $89.99
Quick add
Select Model
Fosi Audio BT20A PRO 300W x2 TPA3255 2 Channel Bluetooth 5.0 Power Amplifier Fosi Audio BT20A PRO 300W x2 TPA3255 2 Channel Bluetooth 5.0 Power Amplifier
$89.99 $99.99
Quick add
Select MODEL
Fosi Audio BT10A Bluetooth Bluetooth Stereo Audio Amplifier Receiver 2CH 50W x 2 BT10A
$59.99 $79.99
Quick add
Select Color
Select Color