Fosi Audio

Fosi Audio BT20A Pro 2-Channel Bluetooth Power Amplifier


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The New Beat

Introducing the Fosi Audio BT20A Pro, a next-generation power amplifier. This Bluetooth amplifier, powered by the high-performance Texas Instruments 3255 amp chip, promises up to 300W of power per channel. Crafted for the audiophile, its ultra-low distortion and tone control capabilities offer a precision audio experience. 

Fill the Room

With a maximum power output of 300Wx2 at 4Ω, this amplifier lets you fill the room with crystal-clear sound, whether you're enjoying Beethoven or Bad Bunny. The integration of the Texas Instruments 3255 amp chip allows for superior audio quality across the board, with minimal distortion.

Connect with ease: Bluetooth 5.0

Connect your smartphone, tablet, or any Bluetooth device quickly and enjoy your favorite tunes without the hassle of cables. 

Logarithmic Taper A Volume Pot

The BT20A Pro comes with personalized control knobs, featuring a logarithmic taper A pot for smooth gain adjustments. Tweak the treble and bass to dial in the right sound profile, ensuring every note hits just right.

High-end chip set

At the heart of the BT20A Pro is the high-end Texas Instruments TPA3255 chip, which supports a power supply range of 24V~48V. This chip is the secret behind the amplifier's premium sound quality, combining class-D efficiency with low power stage idle losses for impeccable audio performance.

Replaceable Op-amp chips

The replaceable op-amp chip feature allows you to tailor the sound signature to your preferences. Swap out the socketed NE5532 with your favorite op chips and enjoy a personalized listening experience that’s truly your own.

Product highlights

  • High-performance Texas Instruments 3255 amp chip
  • Up to 300W power per channel with ultra-low distortion
  • Tone controls for tailored treble and bass adjustments
  • Bluetooth 5.0 for easy and quick wireless connectivity
  • Personalized control knobs with logarithmic taper A pot
  • Replaceable op-amp chips for customized sound signatures
  • High-quality inductors for stable and large power output
  • Superior audio performance with class-D efficiency


  • Max Power Output: 300Wx2 @4Ω
  • SNR: ≥108dB
  • Terminating Impedance: 2-8Ω
  • THD: 0.005%
  • Power Amplifier Chip: TPA3255
  • Power Supply: 32V 5A
  • Input Range: DC 24V-48V
  • Frequency Response Range: 20Hz-20kHz(±1.2dB)
  • Bluetooth Transmission Range: Up to 50Ft
  • Bluetooth Codec: AAC/SBC
  • Audio Input: RCA/Bluetooth
  • Audio Output: Speaker Output/3.5mm Pre-out

What’s included

  • BT20A Pro × 1
  • User Manual × 1
  • Bluetooth Antenna × 1
  • 32V/5A Power Supply × 1

Apos Promise

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