Price: $99.99 - $79.99
(as of Aug 11, 2025 02:29:29 UTC – Details)
Product Description
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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.
Quick Tips:
– Using a turntable? Ensure it has a built-in phono preamp or connect an external one(required for proper volume).
– Is Bluetooth unstable? Check if the antenna is securely installed and keep it away from other wireless devices(e.g., Wi-Fi routers).
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
Customers say
Customers find the amplifier delivers great sound quality, with one noting its punchy low frequencies, and appreciate its powerful performance, with one mentioning it can fill a medium-sized room. The Bluetooth connectivity receives praise for its incredible range, and customers find it easy to set up and use, taking seconds to hook up. The device offers excellent value for its size and price, and customers like its build quality, with one describing it as “built like tanks.” They appreciate its compact design, particularly for small spaces.
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