---
product_id: 393820985
title: "- Fosi Audio BT20A Pro Bluetooth 5.0 Amplifier, 300W x2 Wireless Amp, TPA3255 2 Channel Mini Class D Integrated Home Audio Outdoor Stereo Receiver with Bass Treble Control for Passive Speakers"
brand: "fosi audio"
price: "$229.90"
currency: USD
in_stock: true
reviews_count: 13
category: "Fosi Audio"
url: https://www.desertcart.us/products/393820985-fosi-audio-bt20a-pro-bluetooth-5-0-amplifier-300w-x2
store_origin: US
region: United States of America
---

# Bluetooth 5.0 wireless range ≥15m 600W peak power output Customizable bass & treble controls - Fosi Audio BT20A Pro Bluetooth 5.0 Amplifier, 300W x2 Wireless Amp, TPA3255 2 Channel Mini Class D Integrated Home Audio Outdoor Stereo Receiver with Bass Treble Control for Passive Speakers

**Brand:** fosi audio
**Price:** $229.90
**Availability:** ✅ In Stock

## Summary

> 🎧 Elevate your sound game — small amp, massive impact!

## Quick Answers

- **What is this?** - Fosi Audio BT20A Pro Bluetooth 5.0 Amplifier, 300W x2 Wireless Amp, TPA3255 2 Channel Mini Class D Integrated Home Audio Outdoor Stereo Receiver with Bass Treble Control for Passive Speakers by fosi audio
- **How much does it cost?** $229.90 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/393820985-fosi-audio-bt20a-pro-bluetooth-5-0-amplifier-300w-x2)

## Best For

- fosi audio enthusiasts

## Why This Product

- Trusted fosi audio brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Powerhouse Performance:** Dual 300W channels deliver room-filling sound with minimal distortion (THD ≤0.03%)
- • **Precision Sound Control:** Dedicated bass and treble knobs with neutral midpoint for authentic, balanced audio
- • **Audiophile Customization:** Swap Op-Amps to tailor your sound signature for a truly personalized listening experience
- • **Compact & Durable Design:** Premium anodized aluminum chassis fits effortlessly into any modern home or office setup
- • **Seamless Wireless Connectivity:** Bluetooth 5.0 ensures stable, long-range streaming with quick pairing and memory function

## Overview

The Fosi Audio BT20A Pro is a compact, high-efficiency Class D amplifier featuring Texas Instruments' TPA3255 chip, delivering 300W per channel at 4Ω with ultra-low distortion and noise. Equipped with Bluetooth 5.0 for wireless streaming up to 15 meters, it offers customizable sound via replaceable Op-Amps and precise bass/treble controls. Its robust anodized aluminum build and versatile connectivity options make it a top-tier choice for millennials seeking premium audio performance in a sleek, space-saving package.

## Description

Product Description The upgraded version of Fosi Audio BT20A Fosi Audio BT20A Pro 600W TPA3255 Bluetooth 2.0 CH Amplifier Input: Bluetooth + RCA; Output: Passive Speakers + Pre-out Amp chip: TPA3255; MAX Output Power: 300Wx2@4Ω THD: ≤ 0.03%; SNR: ≥108dB; Frequency Response rRange: 20Hz-20kHz(±1.2dB) Bluetooth Distance: ≥15m; Bluetooth Transmission Format: SBC/AAC Bluetooth 5.0 Connectivity Allowing you to connect your devices such as mobile phones and tablets from a greater distance. Unique Design for Sound Control Experience the authentic sound without any added effects by adjusting them to their middle points. Full-range Pre-Out Output Easily connect to a powered subwoofer, speaker, or another amplifier for versatile audio options. Texas Instrument TPA3255 Chip Has a unique smart algorithm that optimizes the output stage for max efficiency and min distortion. Upgrade Audio Performance Achieve a Distinct and Exceptional Sound Quality The two plug-in NE5532 Op-Amps can be replaced by LME49720HA/MUSES02/OPA2134PA Op-Amps, etc. High Precision and Stability Inductance Values Low DC resistance and excellent frequency characteristics which improve performance Energy-efficient The 2-channel amplifier uses a low standby power feature that reduces the power consumption when the amplifier is not in use, contributing to energy savings. Stunning Bluetooth Design Clear the Bluetooth pairing by holding the volume control for five seconds. Benefit from easy pairing with the memory function and an alert tone. Comparison BT20A PRO BT20A BT30D BT30D PRO TB10D V3

Review: Fosi BT20A PRO - Small yet bombastic 👍👌🇮🇳🇮🇳🇮🇳 - This is a honest review of FOSI BT20A PRO. After trying a few Inexpensive yet good class D amps, I decided to go for the fosi bt20a pro, as its based on Tpa3255 and has the bluetooth & rca connection options (till 6.months back there were too few BT amps from fosi or aiyima) Here is my review Build : Pretty solid, everything is upto the mark, the aluminium used high grade anodised one, no creaks and squeaks anywhere when you hold the amp. All the three knobs (bass treble and Volume) are sturdy but somehow the one I got had a kinna wobbly volume knob, dunno if it's just me or this is the way it is. The back connectors and sockets are placed pretty close to each other but with some small maneuvering everything can be pushed, tied and fixed. Accessories There comes a bluetooth antenna the standard one & decent enough, which you have to add yourself. POWER SUPPLY : the amp is rated to work from 24v to 48v power supply but is shipped with a Fosi branded 32V 5A one.. It does what is expected of it and the output is sufficient..(at lest fir my use case scenario is more than enough) The wire provided with the power supply adapter is of adequate length, the block and wires all look decent and feel study enough . Checked its voltage and it does produce what is claimed 32.4V to 32.5V. Functionality.. Bluetooth connects in a jiffy and the coverage is good. Kinna tricky sometimes to get the connection changed but by and large it's easy to switch from BT to RCA There is also a socket of 3.5mm pre out at the back which can be used to supply signals to an active subwoofer which is awesome in my view... But I don't think I ll ever need that because the amp giving enough thump already with the pair or my Sony passive speakers. This same socket can be used to connect this amplifier as a preamp to another amplifier if you want.. ONE VERY IMPORTANT THING : The amp comes with replaceable op amp chips, (which require the user to remove the screws and slide out the motherboard and then chnage the op amp chips) the more enthusiastic audiophiles who like to experiment with different sound signatures can change them according to their preference.. FOSI has suggested a number of op amp chips that one can try after purchasing them from market or from online.. (there a few available at desertcart India as well) In my personal view it is sounding pretty good as it is so for majority of users there is absolutely no need to experiment with the op amp chips. Audio quality Please note I use my SONY BOOKSHELF SPEAKERS with this.. The one which came with my Az2d music system they have a kind of plasticky cone hence the bass is pretty tight and I love that. Via Bluetooth it sounded pretty decent (please note I use Spotify with highest streaming audio quality on an iPhone) Through RCA I stream via my Google chromecast audio and the sound is fantastic. Over all its pretty loud, the tone knobs do a good job and the best part is there is a neutral point for both bass and Treble exactly in the center so you get a good reference point.. The low freq response is awesome which is genuinely deep and tight, the high freq are pretty good too but may be a bit more wanting like 10% lesser than the bass response... But that's just me... Over all it has played everything nicely that I have thrown at it... Mids are pretty good ( as you are to manage the mids via your preamp etc, you can further enhance them as well) Be it the jazz, or Bollywood music, or ghazals by Mehdi Hassan and Live Indian Classical renditions in both vocal and instrumental, it played everything nicely (of course you have to adjust the knobs according to the type of music as well as the source quality) Edit : after using for more than a month I can say the sound is pretty neutral and with a wide stage, the high frequencies need a tad extra kick for my liking so I am trying to arrange a preamp now to boost the quality further.. But one thing is for sure, via Google chromecast audio (which technically means that there is a proper DAC before the RCA input (as the GCA has a dedicated DAC in it) this thing just sounds so great.. Please note : type of drivers (speakers) plays another huge role so please use atleast half decent ones with these... All in all I am pretty happy, would have loved a fully functional remote and a knob to manage the mids too (I know that's tricky) Would have loved to have couple of more connectivity options like optical etc but I know I will never use them so doesn't matter, but having them would have been great even if just for academic purposes... In the end I can safely say that its a pretty good small package Would highly recommend it as tpa3255 chip perfoms extremely well and with its implementation on the fosi board it produces very loud audio without much distortion... There is no hissing or clicking when the amp is idle and it doesn't get hot (that much) as well.. Thanks
Review: Wonderful - Best D-class amplifier. Amazing sound quality even from decades old speakers. Doesn't overheat like other amplifiers when played on high volume for a long period. Bluetooth connects very fast, it connects under a second, and the bluetooth range is very great as well, it doesn't disconnect even if there are multiple walls in between and the device is meters away. Knobs for volume, bass, treble are good. I personally like the toggle switch for on/off. Value for money? Indeed. If the speakers which are being connected to it have woofers, there is no need for separate active woofers, this handles them good and every frequency- high (in tweeters), mid (vocals in mid-freq. drivers), and lows (woofer- bass) are good and audible clearly.

## Features

- 300 Watts x 2 Power Output: The TI TPA3255 chip amplifier has a feedback design and high-speed gate driver error connection for efficient and quality audio performance, with a low idle loss of <2.5W
- High-Efficiency: The chip amplifier has replaceable Op-Amps for a custom approach when compared to the BT20A amplifier. Further, you can swap the 2 plug-in NE5532 Op-Amps for LME49720HA, MUSES02, OPA2604AP, OPA2134PA, LM4562, or NJM4556AD Op-Amps to achieve distinct sound qualities. It boasts an SNR≥108dB and THD≤0.005%
- Bluetooth 5.0 Connectivity: The Bluetooth pair can be removed by pressing and holding the volume control for 5 seconds, and it also has a memory function for easy pairing and an alert tone for convenience
- Custom Sound with Bass and Treble Controls: The BT20A Pro home audio amplifier has a sound control design so that you can experience sound without effects by setting treble and bass effects to the middle point
- Package Contents: The package contains a BT20A Pro power amplifier, a Bluetooth antenna, a 32V/5A power adapter, an AC cord, and a user manual

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07JVFY27T |
| Best Sellers Rank | #7,687 in Electronics ( See Top 100 in Electronics ) #2 in Hi-Fi Amplifiers |
| Box Contents | Electronic Component Amplifier |
| Brand Name | Fosi Audio |
| Country of Origin | China |
| Customer Reviews | 4.4 out of 5 stars 2,635 Reviews |
| Importer Contact Information | support@fosiaudio.com |
| Item Type Name | Amplifier |
| Item Weight Unit of Measure | 547 Grams |
| Manufacturer | Fosi Audio |
| Manufacturer Part Number | BT20A Pro |
| Model Number | BT20A PRO |
| Packer Contact Information | support@fosiaudio.com |

## Product Details

- **Item dimensions L x W x H:** 14.2 x 10.7 x 0.4 Centimeters
- **Manufacturer:** Fosi Audio
- **Maximum Supply Voltage:** 32 Volts
- **Minimum Supply Voltage:** 24 Volts
- **Voltage:** 32 Volts

## Images

![- Fosi Audio BT20A Pro Bluetooth 5.0 Amplifier, 300W x2 Wireless Amp, TPA3255 2 Channel Mini Class D Integrated Home Audio Outdoor Stereo Receiver with Bass Treble Control for Passive Speakers - Image 1](https://m.media-amazon.com/images/I/61ne1lo34ML.jpg)
![- Fosi Audio BT20A Pro Bluetooth 5.0 Amplifier, 300W x2 Wireless Amp, TPA3255 2 Channel Mini Class D Integrated Home Audio Outdoor Stereo Receiver with Bass Treble Control for Passive Speakers - Image 2](https://m.media-amazon.com/images/I/61jnZu6f6XL.jpg)
![- Fosi Audio BT20A Pro Bluetooth 5.0 Amplifier, 300W x2 Wireless Amp, TPA3255 2 Channel Mini Class D Integrated Home Audio Outdoor Stereo Receiver with Bass Treble Control for Passive Speakers - Image 3](https://m.media-amazon.com/images/I/71SqLCGhM7L.jpg)
![- Fosi Audio BT20A Pro Bluetooth 5.0 Amplifier, 300W x2 Wireless Amp, TPA3255 2 Channel Mini Class D Integrated Home Audio Outdoor Stereo Receiver with Bass Treble Control for Passive Speakers - Image 4](https://m.media-amazon.com/images/I/61MOCgOs-HL.jpg)
![- Fosi Audio BT20A Pro Bluetooth 5.0 Amplifier, 300W x2 Wireless Amp, TPA3255 2 Channel Mini Class D Integrated Home Audio Outdoor Stereo Receiver with Bass Treble Control for Passive Speakers - Image 5](https://m.media-amazon.com/images/I/61H0451axVL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fosi BT20A PRO - Small yet bombastic 👍👌🇮🇳🇮🇳🇮🇳
*by A***B on 25 August 2023*

This is a honest review of FOSI BT20A PRO. After trying a few Inexpensive yet good class D amps, I decided to go for the fosi bt20a pro, as its based on Tpa3255 and has the bluetooth & rca connection options (till 6.months back there were too few BT amps from fosi or aiyima) Here is my review Build : Pretty solid, everything is upto the mark, the aluminium used high grade anodised one, no creaks and squeaks anywhere when you hold the amp. All the three knobs (bass treble and Volume) are sturdy but somehow the one I got had a kinna wobbly volume knob, dunno if it's just me or this is the way it is. The back connectors and sockets are placed pretty close to each other but with some small maneuvering everything can be pushed, tied and fixed. Accessories There comes a bluetooth antenna the standard one & decent enough, which you have to add yourself. POWER SUPPLY : the amp is rated to work from 24v to 48v power supply but is shipped with a Fosi branded 32V 5A one.. It does what is expected of it and the output is sufficient..(at lest fir my use case scenario is more than enough) The wire provided with the power supply adapter is of adequate length, the block and wires all look decent and feel study enough . Checked its voltage and it does produce what is claimed 32.4V to 32.5V. Functionality.. Bluetooth connects in a jiffy and the coverage is good. Kinna tricky sometimes to get the connection changed but by and large it's easy to switch from BT to RCA There is also a socket of 3.5mm pre out at the back which can be used to supply signals to an active subwoofer which is awesome in my view... But I don't think I ll ever need that because the amp giving enough thump already with the pair or my Sony passive speakers. This same socket can be used to connect this amplifier as a preamp to another amplifier if you want.. ONE VERY IMPORTANT THING : The amp comes with replaceable op amp chips, (which require the user to remove the screws and slide out the motherboard and then chnage the op amp chips) the more enthusiastic audiophiles who like to experiment with different sound signatures can change them according to their preference.. FOSI has suggested a number of op amp chips that one can try after purchasing them from market or from online.. (there a few available at Amazon India as well) In my personal view it is sounding pretty good as it is so for majority of users there is absolutely no need to experiment with the op amp chips. Audio quality Please note I use my SONY BOOKSHELF SPEAKERS with this.. The one which came with my Az2d music system they have a kind of plasticky cone hence the bass is pretty tight and I love that. Via Bluetooth it sounded pretty decent (please note I use Spotify with highest streaming audio quality on an iPhone) Through RCA I stream via my Google chromecast audio and the sound is fantastic. Over all its pretty loud, the tone knobs do a good job and the best part is there is a neutral point for both bass and Treble exactly in the center so you get a good reference point.. The low freq response is awesome which is genuinely deep and tight, the high freq are pretty good too but may be a bit more wanting like 10% lesser than the bass response... But that's just me... Over all it has played everything nicely that I have thrown at it... Mids are pretty good ( as you are to manage the mids via your preamp etc, you can further enhance them as well) Be it the jazz, or Bollywood music, or ghazals by Mehdi Hassan and Live Indian Classical renditions in both vocal and instrumental, it played everything nicely (of course you have to adjust the knobs according to the type of music as well as the source quality) Edit : after using for more than a month I can say the sound is pretty neutral and with a wide stage, the high frequencies need a tad extra kick for my liking so I am trying to arrange a preamp now to boost the quality further.. But one thing is for sure, via Google chromecast audio (which technically means that there is a proper DAC before the RCA input (as the GCA has a dedicated DAC in it) this thing just sounds so great.. Please note : type of drivers (speakers) plays another huge role so please use atleast half decent ones with these... All in all I am pretty happy, would have loved a fully functional remote and a knob to manage the mids too (I know that's tricky) Would have loved to have couple of more connectivity options like optical etc but I know I will never use them so doesn't matter, but having them would have been great even if just for academic purposes... In the end I can safely say that its a pretty good small package Would highly recommend it as tpa3255 chip perfoms extremely well and with its implementation on the fosi board it produces very loud audio without much distortion... There is no hissing or clicking when the amp is idle and it doesn't get hot (that much) as well.. Thanks

### ⭐⭐⭐⭐⭐ Wonderful
*by A***R on 21 April 2026*

Best D-class amplifier. Amazing sound quality even from decades old speakers. Doesn't overheat like other amplifiers when played on high volume for a long period. Bluetooth connects very fast, it connects under a second, and the bluetooth range is very great as well, it doesn't disconnect even if there are multiple walls in between and the device is meters away. Knobs for volume, bass, treble are good. I personally like the toggle switch for on/off. Value for money? Indeed. If the speakers which are being connected to it have woofers, there is no need for separate active woofers, this handles them good and every frequency- high (in tweeters), mid (vocals in mid-freq. drivers), and lows (woofer- bass) are good and audible clearly.

### ⭐⭐⭐⭐ Good amplifier
*by A***R on 29 November 2025*

Pros: 1. No hissing or power on pop sound. 2. Mild heating, even after running for 5 hours 3. Well built and feels solid 4. Bluetooth connects properly and sound quality is good. 5. Bass cntrol and treble is also good. Treble works better than bass. 6. Size is small and does not occupy space. Can be kept on top of speaker. Cons 1. Amplification seems to be little less. Since the volumen control is lograthimic, you have to keep the knob greater than 60% to get a decent volume. Overall, value for money. I mostly listen to classical and old Hindi songs and the sound quality is good.

## Frequently Bought Together

- Fosi Audio BT20A Pro Bluetooth 5.0 Amplifier, 300W x2 Wireless Amp, TPA3255 2 Channel Mini Class D Integrated Home Audio Outdoor Stereo Receiver with Bass Treble Control for Passive Speakers
- Banana Plugs with Dual Set Screws,Black and Red Aluminum Shell,6 Pairs
- Amazon Basics Speaker Cable, Easy Assembly, 16-Gauge, Bronze, 100 ft

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-20*