---
product_id: 85729159
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: "A$212"
currency: AUD
in_stock: true
reviews_count: 13
category: "Fosi Audio"
url: https://www.desertcart.com.au/products/85729159-fosi-audio-bt20a-pro-bluetooth-5-0-amplifier-300w-x2
store_origin: AU
region: Australia
---

# Bluetooth 5.0 wireless range 600W total power output Customizable bass & treble control 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:** A$212
**Availability:** ✅ In Stock

## Summary

> 🎧 Elevate your soundscape—because your speakers deserve a pro touch!

## 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?** A$212 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/85729159-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

- • **Tailor Your Sound:** Adjust bass and treble independently to craft your perfect audio vibe—no presets, just pure control.
- • **Compact & Versatile:** Mini Class D design fits anywhere, powering passive speakers with low idle power consumption (<2.5W).
- • **Powerhouse Performance:** 300W x2 channels deliver room-filling, crystal-clear sound for your home or outdoor setup.
- • **Audiophile-Grade Components:** Equipped with TI TPA3255 chip and swappable Op-Amps for scalable, high-fidelity sound customization.
- • **Seamless Wireless Connectivity:** Bluetooth 5.0 ensures quick pairing, stable streaming, and memory function for effortless use.

## Overview

The Fosi Audio BT20A Pro is a compact, high-efficiency Class D amplifier delivering 300W per channel with Bluetooth 5.0 wireless connectivity. Featuring the TI TPA3255 chip and customizable bass/treble controls, it supports swappable Op-Amps for tailored sound profiles. Ideal for both indoor and outdoor passive speaker setups, it combines audiophile-grade performance with user-friendly features and low power consumption.

## Description

Product description Bluetooth amp stereo 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 THD: ≤ 0.005%; SNR: ≥108dB; MAX Output Power: 300Wx2@4Ω （Using a 48V10A Power Supply） *Note: It should be emphasized that 300W refers to the maximum power supported by the product's chip, which can only be achieved with a 48V 10A power supply. The power supply's voltage and current determine the amplifier's maximum output. For more details, please refer to the illustration below on Power Variability. Bluetooth Distance: ≥15m Bluetooth Transmission Format: SBC/AAC Note: The amp prioritizes Bluetooth and doesn't support simultaneous RCA and Bluetooth input. 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 Friendly Solutions Guide 2. Optimize Setup & Audio Sources: (1)Speaker Upgrade: Use high-resolution speakers placed at least 30cm away from walls or corners. Add rugs or curtains to reduce echoes. (2) Audio Quality: Play lossless music formats(e.g., FLAC, WAV) on dedicated devices(e.g., music players or updated phones/computers).(3) EQ Adjustment: Reset the equalizer to the neutral(flat) position initially. Adjust bass/treble gradually(like adjustments to 50% of the scale). 3. Reduce Environmental Interference (1) Anti-Interference Cables: Use shielded RCA cables with grounding(metal-shell connectors) to minimize buzzing. (2) Distance from Interference: Keep audio/Bluetooth cables ≥30cm away from routers, power outlets, or microwaves. (3) Troubleshoot Sources: Test the same song on another phone/computer. If the noise persists, contact support for a replacement. Note: This product is designed to prioritize Bluetooth over RCA when both are connected and doesn't support dual-input playback simultaneously. Comparison Chart BT20A PRO Type Bluetooth 2.0 CH Amp MAX Power Output 300W x 2 Input Bluetooth + RCA Output Passive SPK +Pre-out Treble&Bass Control THD ≤ 0.005% SNR ≥108dB Learn More BT20A PRO Type Bluetooth 2.0 CH Amp MAX Power Output 300W x 2 Input Bluetooth + RCA Output Passive SPK +Pre-out Treble&Bass Control THD ≤ 0.005% SNR ≥108dB HT4S Type Bluetooth 4.1 CH Amp MAX Power Output 30w*4+60W*1 Input BT + 3.5mm AUX + OPT Output Pre-Out+SPK Out Treble&Bass Control THD ≤ 0.03% SNR ≥88dB Learn More HT4S Bluetooth 4.1 CH Amp 30w*4+60W*1 BT + 3.5mm AUX + OPT Pre-Out+SPK Out ≤ 0.03% ≥88dB MC351 Type Bluetooth 2.1 CH Amp MAX Power Output 165W x 2 + 350W @ 4Ω Input BT+RCA+COA+OPT+USB Output SPK/SUB/PRE OUT Treble&Bass Control THD ≤0.03% SNR ≥100dB Learn More MC351 Bluetooth 2.1 CH Amp 165W x 2 + 350W @ 4Ω BT+RCA+COA+OPT+USB SPK/SUB/PRE OUT ≤0.03% ≥100dB V3 Type 2.0 CH Amp MAX Power Output 300W x 2 Input RCA Output Passive SPK +Pre-out Treble&Bass Control THD <0.003% SNR ≥110dB Learn More V3 2.0 CH Amp RCA <0.003% ≥110dB P3 Type Headphone Amp+Preamp MAX Power Output - Input Bluetooth + RCA Output RCA+Headphone+AUX Treble&Bass Control THD ≤ 0.02% SNR ≥103dB Learn More P3 Headphone Amp+Preamp - RCA+Headphone+AUX ≤ 0.02% ≥103dB

Review: Amazing Clean Powerful Streaming - I admit that I have little knowledge of audio And electronics. I thought 300 watts of audio power had to come from a big heavy expensive amp. My new house came with 8 ceiling speakers . I had no idea whether they worked or sounded decent. The previous owner left an AVX speaker selector next to a bunch of speaker wires that were coming out of a wall port. I called Cambridge Audio and an advisor told me I would need to buy an amp costing at least $600 to run the speakers. Since I had no idea how it would sound , i looked on desertcart for an alternative. I took a chance on this tiny inexpensive Fosi amp to see if the setup even worked. It turns out that 3 of the 4 zones work and each sounds great using my phones Bluetooth and Apple Music through the Fosi into the speaker selector . I am being cautious with this setup , but I have determined that I can definitely power three zones simultaneously at rockin’ volume. The bass is not earth shaking , but is ok. I am amazed at the sound . Since the speaker selector has an impedance protector switch, I am relatively certain that I will be able to run 3 zones simultaneously without blowing out the speakers. I think the Fosi Amp is great . I am not audiophile and have reasonable expectations. The amp has an 18 month warranty. It is tiny and the Bluetooth is so strong that I do not have to leave my phone next to the amp. I highly recommend this tiny Bluetooth amp.
Review: A (super pleasantly) Surprising Little Amp with a Ton of Power and Terrific Sound - This is an absolutely terrific little tiny amp. I cannot attest to the actual wattage of this unit but I can share that this has a nice amount of power and headroom for such a small amp. I am using it in my basement workshop. It is connected to a pair of old Boston Acoustic 2-way bookshelf speakers and an EverSolo DMP-A6 as source. I never turn the Fosi up beyond 10 o’clock on the volume and usually run it around 8-9. The sound is crisp. The dynamics are tremendous. It has breathed new life into a very old pair of speakers and with the Eversolor A6, it is a modern streaming config. The amp is literally a fraction of the size of my EverSolo, thus it fits virtually anywhere. It gets only somewhat warm at most and this is after running it for hours. I absolutely love this little guy and could see so many different uses for it: an outdoor audio set up, a garage set up, heck, you probably could drive some efficient floor standing speakers with this thing. I strongly recommend this if you want a tiny amp with terrific tone controls and power. The sound is simply crisp, precise, powerful… surprising (and I own several pricey, proper audio rigs in my home).

## 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 | #2,081 in Electronics ( See Top 100 in Electronics ) #4 in Audio Component Amplifiers |
| Brand | Fosi Audio |
| Built-In Media | BT20A Pro Bluetooth Amplifier x1, 32V 5A Power Adapter x1, User Manual x1 |
| Customer Reviews | 4.5 out of 5 stars 2,662 Reviews |
| Item Weight | 547 Grams |
| Manufacturer | Fosi Audio |
| Mfr Part Number | BT20A Pro |
| Model Number | BT20A PRO |
| Unit Count | 1.0 Count |

## Product Details

- **Item dimensions L x W x H:** 5.59 x 4.21 x 0.16 inches
- **Manufacturer:** Fosi Audio
- **Maximum Supply Voltage:** 32 Volts (DC)
- **Minimum Supply Voltage:** 32 Volts (DC)
- **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/61H0451axVL.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/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 4](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 5](https://m.media-amazon.com/images/I/71SqLCGhM7L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Amazing Clean Powerful Streaming
*by P***R on August 27, 2025*

I admit that I have little knowledge of audio And electronics. I thought 300 watts of audio power had to come from a big heavy expensive amp. My new house came with 8 ceiling speakers . I had no idea whether they worked or sounded decent. The previous owner left an AVX speaker selector next to a bunch of speaker wires that were coming out of a wall port. I called Cambridge Audio and an advisor told me I would need to buy an amp costing at least $600 to run the speakers. Since I had no idea how it would sound , i looked on Amazon for an alternative. I took a chance on this tiny inexpensive Fosi amp to see if the setup even worked. It turns out that 3 of the 4 zones work and each sounds great using my phones Bluetooth and Apple Music through the Fosi into the speaker selector . I am being cautious with this setup , but I have determined that I can definitely power three zones simultaneously at rockin’ volume. The bass is not earth shaking , but is ok. I am amazed at the sound . Since the speaker selector has an impedance protector switch, I am relatively certain that I will be able to run 3 zones simultaneously without blowing out the speakers. I think the Fosi Amp is great . I am not audiophile and have reasonable expectations. The amp has an 18 month warranty. It is tiny and the Bluetooth is so strong that I do not have to leave my phone next to the amp. I highly recommend this tiny Bluetooth amp.

### ⭐⭐⭐⭐⭐ A (super pleasantly) Surprising Little Amp with a Ton of Power and Terrific Sound
*by R***M on March 15, 2026*

This is an absolutely terrific little tiny amp. I cannot attest to the actual wattage of this unit but I can share that this has a nice amount of power and headroom for such a small amp. I am using it in my basement workshop. It is connected to a pair of old Boston Acoustic 2-way bookshelf speakers and an EverSolo DMP-A6 as source. I never turn the Fosi up beyond 10 o’clock on the volume and usually run it around 8-9. The sound is crisp. The dynamics are tremendous. It has breathed new life into a very old pair of speakers and with the Eversolor A6, it is a modern streaming config. The amp is literally a fraction of the size of my EverSolo, thus it fits virtually anywhere. It gets only somewhat warm at most and this is after running it for hours. I absolutely love this little guy and could see so many different uses for it: an outdoor audio set up, a garage set up, heck, you probably could drive some efficient floor standing speakers with this thing. I strongly recommend this if you want a tiny amp with terrific tone controls and power. The sound is simply crisp, precise, powerful… surprising (and I own several pricey, proper audio rigs in my home).

### ⭐⭐⭐⭐⭐ Excellent Amplifier, excellent sound quality
*by J***R on June 16, 2023*

i have a lot of Fosi audio amps, this one,, sound incredible.. but i go to the next step and i buy the Fosi Audio 48v 5A powersupply... and i will give you my impressions about this powersupply and this amp. i recommend this amplifier... This power supply proved to be an outstanding choice, effortlessly driving my pair of high impedance speakers while delivering impeccable performance. With its reliability, robust build, and impressive capabilities, this power supply exceeded all my expectations. Performance and Compatibility: The 48V 5A power supply flawlessly powered my high impedance speakers, showcasing its exceptional performance capabilities. The impressive voltage output and ample current supply effortlessly met the demands of my amplifier, resulting in clear and dynamic sound reproduction. The power supply consistently delivered a clean and stable power signal, ensuring a distortion-free audio experience. Its compatibility with high impedance speakers allowed me to unlock their true potential, revealing nuanced details and captivating clarity that brought my music collection to life. Reliability and Build Quality: One of the standout features of this power supply is its remarkable reliability. From the moment I connected it to my amplifier, I experienced uninterrupted power delivery and consistent performance. The sturdy build and high-quality components instilled confidence, assuring me of its long-term durability. Additionally, the power supply's efficient cooling system prevented overheating, even during extended listening sessions, which further demonstrated its reliability under demanding conditions. Versatility and Safety: I appreciate the versatility this power supply offers. Its 48V output combined with a 5A current rating make it suitable for a range of audio systems, not just limited to high impedance speakers. Furthermore, the power supply incorporates several safety features, including short-circuit protection and overvoltage safeguards, ensuring the protection of my valuable audio equipment. Conclusion: In conclusion, the 48V 5A power supply has proven to be an exceptional choice for powering high impedance speakers. Its superior performance, reliability, and compatibility with a wide range of audio systems make it a standout option. Whether you're a casual listener or an avid audiophile, this power supply will undoubtedly enhance your audio experience.

## 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 Australia*
*Store origin: AU*
*Last updated: 2026-05-18*