View on Amazon

Product description

The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. Bluetooth amp stereo Merchant Video

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-outTHD: ≤ 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.

1 Bluetooth 5.0

2 Treble/Bass Control

3 PRE-OUT

1 Power Variability

2 Back Side

3 Front Side

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
1 TPA3255 CHIP

2 Replaceable OP CHIP

3 High Power Inductors

Friendly Solutions Guide

1. Check Connections & Device Compatibility: (1)Ensure all audio cables are fully inserted and undamaged. Replace any frayed cables with high-quality shielded ones(recommended: cables with metal connectors). (2)Confirm your speakers’ power rating(e.g., 50W/100W) and impedance(e.g., 4Ω/8Ω) match the amplifier’s requirements(see product manual).(3)Avoid raising the volume beyond your speakers’ labeled maximum(e.g., “Max 80%”) to prevent distortion.

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.

BT20A PRO

Comparison Chart

Bluetooth 2.0 CH Amp

Type

Bluetooth 4.1 CH Amp

300W x 2

MAX Power Output

30w*4+60W*1

Bluetooth + RCA

Input

BT + 3.5mm AUX + OPT

Passive SPK +Pre-out

Output

Pre-Out+SPK Out

Treble&Bass Control

≤ 0.005%

THD

≤ 0.03%

≥108dB

SNR

≥88dB

Bluetooth 2.0 CH Amp

Type

Bluetooth 2.1 CH Amp

300W x 2

MAX Power Output

165W x 2 + 350W @ 4Ω

Bluetooth + RCA

Input

BT+RCA+COA+OPT+USB

Passive SPK +Pre-out

Output

SPK/SUB/PRE OUT

Treble&Bass Control

≤ 0.005%

THD

≤0.03%

≥108dB

SNR

≥100dB

Bluetooth 2.0 CH Amp

Type

2.0 CH Amp

300W x 2

MAX Power Output

300W x 2

Bluetooth + RCA

Input

RCA

Passive SPK +Pre-out

Output

Passive SPK +Pre-out

Treble&Bass Control

≤ 0.005%

THD

<0.003%

≥108dB

SNR

≥110dB

Bluetooth 2.0 CH Amp

Type

Headphone Amp+Preamp

300W x 2

MAX Power Output

–

Bluetooth + RCA

Input

Bluetooth + RCA

Passive SPK +Pre-out

Output

RCA+Headphone+AUX

Treble&Bass Control

≤ 0.005%

THD

≤ 0.02%

≥108dB

SNR

≥103dB

HT4S

MC351

V3

P3

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