Introduction

The Fosi Audio Hi-Fi Wireless Stereo BT20A is a compact and powerful amplifier designed to elevate your audio experience with ease. Utilizing advanced Class D technology, it delivers high-quality sound while supporting Bluetooth connectivity for wireless streaming from your devices. The amplifier features user-friendly controls and a sleek design, making it an excellent choice for both casual listeners and audiophiles. Priced at approximately $99.99, it offers exceptional value for enhancing your home audio setup.

Product Specifications

Fosi Audio BT20A is a Hi-Fi wireless stereo 2-channel amplifier that features 100W x 2 output, and Bluetooth 5.0 streaming range up to 50ft (15m), it is a mini power amp which is equipped with bass and treble control. Simple compact design but practical and powerful! Home Hi-Fi integrated amplifier designed for the customers who pursue Hi-Fi sound!

Product Overview & Control Functions

Front Panel

1. Power Switch
2. Treble Control
3. Bass Control
4. Volume Control

5. Power Indicator Light

   Back Panel

6. RCA Input
7. Speakers Output
8. DC 24V Input

9. Bluetooth Antenna

   

Package Contents

• Fosi Audio BT20A Amplifier*
• 1 AC Power Cord*1
  24V Power Supply*1 
• Bluetooth Antenna*1 
• Instruction Manual*1

Description

The BT20A amplifier is built with a robust aluminum alloy chassis, ensuring durability and minimizing noise interference. It features a sleek front panel with a LED display and rotary knobs for volume and input selection. The device supports Bluetooth 5.0 technology, allowing seamless pairing with smartphones, tablets, and computers. Additionally, it includes RCA and 3.5mm aux inputs for versatility in connecting different audio sources. The amplifier is designed to deliver clear, high-fidelity sound with minimal distortion, making it suitable for both music and movie enjoyment.

Quick Setup of Fosi Audio Hi-Fi Wireless Stereo BT20A

Preparation

1. Prepare 1: BT20A, 24V power supply, passive speakers, speaker  wires or banana plugs;
2. Prepare 2: Connect the BT20A to the passive speakers via the  speaker wire or banana plugs;
3. Prepare 3: Connect the 24V power supply to the DC input; Prepare 4: Toggle the power switch on the front panel upwards to  turn on the BT20A amplifier. 

Note: Be sure that the volume/power switch is in the OFF position before connecting the power supply.
How to connect the speaker wire?

Method 1: Bare wire connection illustration

1. Release the horn terminals block terminals;
2. Insert the two ends of the speaker wire into the amplifier and speaker terminal holes;
3. Tighten the horn terminals;

Note: Please avoid the speaker wires being exposed and touching the amplifier casing, as this may cause a short circuit fault.

Method 2: Banana plugs connection illustration

1. Release the banana jacket;
2. Loosen the screw;
3. Insertion speaker wire and tighten the screw;
4. Tighten the banana jacket;
5. Insert the banana plug into the horn terminals of the speaker and amplifier.

Note: Please take care to avoid contact between the two banana plugs and causing a short circuit fault as some of the banana plugs are metal-cased.

Bluetooth for example
Prepare your Bluetooth device (take a phone as an example) 

1. Step 1: Install the Bluetooth antenna to the BT20A.
2. Step 2: Turn on the Bluetooth on your phone and search.  “ Fosi Audio”or “Fosi Audio BT20A”, after connecting to BT20A, the indicator light shows blue light.
3. Step 3: Open the audio application, play and enjoy!

RCA Input for example
Prepare: audio source (take a phone as an example), a RCA cable  or a 3.5mm AUX to RCA cable (some devices will need)

• Step 1: Connect your phone to BT20A via a 3.5mm to RCA cable; 
• Step 2: After connecting to BT20A, the indicator light shows red  light;
• Step 3: Open the audio application, play and enjoy!

Note: Please keep the BT20A away from another electric device. The BT20A can't use with a radio simultaneously.

Setup Guide

To set up the Fosi Audio Hi-Fi Wireless Stereo BT20A: 

1. Unboxing: Carefully unpack the amplifier from its box and ensure all accessories are included.
2. Connection: Connect your speakers to the speaker terminals on the back of the amplifier. 
3. Power On: Plug in the power cord and turn on the amplifier. 
4. Pairing: Select the Bluetooth input on the front panel and pair your device with the amplifier. 
5. Volume Adjustment: Adjust the volume using the rotary knob on the front panel.

Comparison Section

Model	BT20A	BT10A	BT30A	BT30D	T20
Picture
Type	2.0 CH Amp	2.0 CH Amp	2.1 CH Amp	2.1 CH Amp	2.0 CH Amp
Bluetooth Version	Bluetooth 5.0	Bluetooth 5.0	Bluetooth 5.0	Bluetooth 5.0	Bluetooth 5.0
Input	Bluetooth + RCA	Bluetooth+ 3.5mm AUX	Bluetooth + RCA	Bluetooth + RCA	Bluetooth + RCA
Output	Passive Speakers	Passive Speakers	Passive (Speakers+ Subwoofer	Passive (Speakers+ Subwoofer) + Powered Subwoofer	Passive Speakers+ Headphone
Power Adapter	24V/4.5A	19V/4.74A	24V/4.5A	24V/4.5A	24V/4.5A
MAX Power Output	100 wattx2	50 wattx2	50 wattx2+ 100 watt	50 wattx2+ 100 watt	50 wattx2

Troubleshooting

Common issues and solutions for the BT20A include: 

• No Sound: Check speaker connections and ensure Bluetooth pairing is successful. 
• Distortion: Adjust volume levels and check for any interference from other electronic devices. 
• Pairing Issues: Restart both the amplifier and your Bluetooth device, then try pairing again.

Warranty Information

All Fosi Audio products have an 18-month limited warranty on parts and labor from the date of purchase. 

Fosi Audio Hi-Fi Wireless Stereo BT20A Pros & Cons

Pros

• High-Quality Sound: Delivers clear and powerful audio with minimal distortion.
• Easy Setup: User-friendly interface makes setup and operation straightforward.
• Versatile Connectivity: Supports Bluetooth, RCA, and 3.5mm aux inputs.
• Durable Build: Robust aluminum alloy chassis for long-lasting performance.

Cons

• Limited Power Output: May not be sufficient for larger speakers or high-demand applications.
• No Remote Control: Requires manual adjustment on the amplifier itself.
• No EQ Settings: Lack of equalizer settings for customizing sound preferences.

Customer Reviews

Customers have praised the BT20A for its clear sound quality, ease of setup, and durable build. However, some users have noted that it lacks a remote control and equalizer settings. Despite these minor drawbacks, the BT20A remains a popular choice among audiophiles on a budget.