Fosi Audio BT20A PRO 300W x2 TPA3255 2 Channel Bluetooth 5.0 Power Amplifier

Regular price
$99.99 USD
Sale price
$99.99 USD
Regular price
$99.99 USD
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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-out
Amp chip: TPA3255; MAX Output Power: 300Wx2@4Ω
THD: ≤ 0.005%; SNR: ≥108dB; Frequency Response Range: 20Hz-20kHz(±1.2dB)

Bluetooth 5.0 Connectivity

Allowing you to connect your devices such as mobile phones and tablets from a greater distance, support to SBC/AAC.

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.

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

Front Side

Back Side

Power Variability

  • TI TPA3255 Chip Amplifier with 300 Watts x 2 Power Output: Advanced feedback design and high-speed gate driver error correction for efficient and high-quality audio performance, with low idle losses of <2.5W.

  • Upgraded High-Efficiency: A significant upgrade from the BT20A amplifier with replaceable Op-Amps for customized. You can replace the two plug-in NE5532 Op-Amps with MUSES02/OPA2604AP/SS3602 Amps to achieve a unique sound quality. With SNR≥108dB and THD≤0.005%.

  • Enhanced Bluetooth 5.0 Connectivity: The Bluetooth pair can be cleared by pressing and holding the volume control for five seconds. In addition, it has a memory Function for Easy Pairing and Alert Tone.

  • Customizable Sound with a Wide Range of Bass and Treble Controls: The BT20A Pro home audio amplifier offers a unique design for sound control. Enjoy original sound without effects by setting treble and bass effects to the middle point.

  • What you Get: BT20A Pro Power Amplifier x1, Bluetooth Antenna x1, 32V 5A Power Adapter x1, AC Cord x1, User Manual x1, our worry-free 24-month warranty, and friendly customer service.
  • Output Power: 300Wx2 @4Ω
  • Terminating Impedance: 2-8Ω
  • Input Mode: Bluetooth + RCA
  • Output Mode: Passive Speakers + Pre-out
  • Frequency Range: 20Hz-20kHz(±1.2dB)
  • THD: ≤0.005%
  • SNR: ≥108dB
  • Chip Set: TPA3255
  • Bluetooth Transmission Distance: Up to 50Ft
  • Bluetooth Transmission Format: SBC/AAC
  • Device Dimension: 5x5x1 inches
  • DC Input Range: 24-48V
  • Power Supply: 32V 5A or 48V 5A
  • BT20A PRO Power Amplifier x 1

  • Bluetooth Antenna x 1

Customer Reviews

Based on 77 reviews
Mike Barham
Great little amp

I have the amp in my shop pushing a pair of vintage Pioneer speakers with 12 inch subs. It sounds decent enough but it certainly can’t overpower them. Overall I’m pleased with the purchase the only thing that concerns me is the unit puts out a LOT of heat, I’m worried about its longevity, time will tell. I forgot to mention that I have the 48 volt power supply, I would suggest it if you’re trying to drive anything large.

stereo setup with Fosi Audio Amp

this amplifier is small but power packed and robust. I purchased it few days back and have played on three sets of book shelf spakers, Sony, Polk Audio and Yamaha. sound quality is execellent . Perfect for stereo listening.


I am using this with some 80s-era Mission 700 speakers.
Fantastic sound.

Incredible sound, I’m listening to it now as I type

I installed the Sparkos SS3602 op amps in about 10 minutes and was simply blown away. I’m running TIDAL streams through a pair of Klipsch R-41M and am so happy I want an excuse to buy another set just like this. For very little $ you get a jaw dropper.

Mike Timmer
Review BT20 Pro

I bought the Fosi with a 48v power supply to get the maximum power out of the Fosi amp although the 32v power supply might have been sufficient for my speakers.
It gets warm. I wonder why Fosi made it so small, as a bigger case has more room to spread the warmth.
It might even look nicer in a bigger case with some big feet at the bottom.

The sound quality is really good and the trebbe and bass works very well to tweak the sound to your likings.

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