Small. yet Powerful

Fosi Audio BT20A Stereo 2.0 CH Bluetooth Amplifier

BT20A Banner

Meet the Fosi Audio BT20A
Mini Amplifier

The Fosi Audio BT20A, in this regard, has been one of the best Pocket Amplifiers of 2022. Typically, this little device is a complete audio setup if you plan to build a sound system for your dorm, desktop, or office. We think the BT20A amplifier is the right choice for you to listen to and enjoy your music playlist on the go without any hassle of complicated installation.

2.0 Channel Bluetooth Stereo Amplifier

Treble Control & Bass Control

fosi audio customer bt20a
Small yet Powerful
Lily likes to play with crayons and pencils

Even though Fosi Audio BT20A is less than four inches, it is tested for high-quality sound under extreme conditions. It is a powerful mini audio amplifier sufficient to power up prominent tower speakers. Also, this mini amp is designed to handle deep bass tones while producing hi-fi sounds that will make it a hit with audio enthusiasts.

fosi audio bt20a audio amplifier
Excellent Hi-Fi audio quality
Lily likes to play with crayons and pencils

Easily connects to smartphones, tablets, and almost any other Bluetooth-enabled device, the Bluetooth 5.0 chip maintains a strong, stable connection up to 50 feet for skip-free music.


Small Size with Powerful Features

Wireless Connectivity

Advanced Audio Controls

Passive Speaker Companion

Premium Sound Quality


Irresistible Design


Power Adapter: 24V/4.5A

DC Input Range: 12-24V

Terminating Impedance: 2 Ohm - 8 Ohm

MAX Power Output: 100W x 2

THD ≤ 0.04%

Frequency Range: 20Hz - 20kHz (±1 dB)

SNR ≥ 98dB

Input Sensitivity ≤ 280mV

Input Mode: Bluetooth and RCA

Bluetooth Transmission Distance: Up to 50 Ft



This is a LITTLE but powerful amp. The amp itself fits in the palm of your hand. The power supply for the amp is about as big as the amp itself. Bluetooth syncing with my smart phone was super simple. You basically turn the amp on, look for the device on your phone and hit sync. That's it. No extra buttons to push or codes to enter. Super simple. Sound quality was excellent.
John Borthwick
July 4, 2019
Well, I couldn’t recommend this highly enough. I bought this based mainly on all of the positive reviews. I’m glad I did. I bought this mainly for the power ratings. I have somewhat of an unorthodox set up. I have an Oppo blue ray player I’m using as a CD transport and a Rasberry Pi with a HIFI hat for a Spotify connect node running into a Schiit Modi 3 and then into the Fosi. Sound is detailed and full.
Bella Jim
March 4, 2020
This review refers to the Fosi BT20a.....pushing a pair of Cambridge SoundWorks Newton MC100's while awaiting the arrival of my QAcoustics 3020i's......plenty of power....goodness.....hard to believe this little guy can produce such clean, effortless sound. Go ahead and pull the plug on this little truly does have a lot of ooomph.
Rick Wick
January 27, 2021
The BT20A met my needs exactly and fully. Now I can stream my Amazon Music Unlimited playlists from the office Dot to the BT20A which drives the SL-260 speakers directly. Now I can listen to my music at high quality. Very satisfying. Never would I have imagined that there was such a device as this, but now that I've found it, I can bring high quality sound anywhere around the house I want without having to move stereo components or settle for typical BT portable speakers. And at a cost that's actually an amazing value. I love it!
Ribeka Cruz
Founder & CEO