FOSI Audio v3 Review

If you are looking for a high-quality, affordable and versatile stereo power amplifier, you might want to check out the Fosi Audio V3 – 2 channel Stereo Power Amplifier. This device is designed to deliver clear, powerful and dynamic sound to your speakers.  For my particular use case, I use them connected to a desktop computer to power some passive speakers.  This replaced a set of Creative Pebble speakers.  

The Fosi Audio V3 is a compact and sleek amplifier that measures 4.1 x 3.9 x 1.5 inches and weighs only 1.1 pounds. It has a solid metal chassis and a brushed aluminum front panel that looks elegant and modern. The front panel has a volume knob which also acts as a power switch and a blue LED indicator. The back panel has two RCA inputs, two speaker outputs and a power input.  Mine came with the 32 Volt, 5 amp power supply but I am currently using the 48v, 5 amp power supply from FOSI that I took from my BT20A Pro.  Note that the 48 volt power supply is almost as big as the amplifier.

The Fosi Audio V3 is easy to set up and use. You just need to connect your audio source to the RCA inputs, your speakers to the speaker outputs and plug in the power adapter. In my case I also needed a 3.5 Male to 2 Male RCA connector to connect the computer to the amplifier.  Then you can turn on the amplifier and adjust the volume to your preference. 

The Fosi Audio V3 delivers impressive sound quality that is crisp, detailed and balanced. The amplifier has a wide frequency response range from 20Hz to 20kHz and can handle various music genres with ease. The bass is deep and punchy, the midrange is clear and smooth, and the treble is bright and airy. The soundstage is spacious and realistic, with good separation and imaging. The amplifier can drive most speakers with enough power and volume without clipping or distorting.

There are some definite pro/cons compared to the BT20A Pro that I will share


Great Audio Quality

Minimalistic design

Improved Cooling (the case on the BT20A gets much hotter)


Pre-Out is not affected by the volume control (difficult to integrate a sub)

Prefer a separate on/off switch so I can keep the volume level set.

This is my second amplifier from FOSI audio and it is excellent for 2 channel music.  Eventually, I would like a 2.1 amplifier so the addition of a high pass filter like the one on the Dayton Audio DTA-100ST would be a welcome addition.  

The Fosi Audio V3 is a great stereo power amplifier that offers excellent performance, quality and value. It is well-built, easy to use and delivers amazing sound quality that will satisfy any audio enthusiast. It is also very flexible and compatible with various devices and applications that will enhance your audio experience. If you are looking for a stereo power amplifier that can do it all, you should definitely consider the Fosi Audio V3.