Fosi Audio BT20A Pro Bluetooth Stereo Power Amplifier

The Fosi Audio BT20A Pro is a compact, high-power Class D stereo amplifier designed to drive passive speakers with authority while keeping distortion and noise low. Built around the TI TPA3255 amplifier chip, it delivers strong output, efficient operation, and clean sound for home audio and desktop speaker systems.

With Bluetooth and RCA inputs, flexible tone controls, and a pre-out connection, the BT20A Pro works well as a simple power amp or as part of a small, expandable HiFi setup.

Features

• High-output Class D stereo amplifier based on the TI TPA3255 chipset
• Delivers up to 300 W per channel at 4 Ω for driving demanding passive speakers
• Efficient amplifier design with low idle power consumption
• Bluetooth 5.0 wireless audio streaming with pairing memory and reset function
• Analog RCA input for connecting DACs, preamps, or other audio sources
• Speaker outputs for passive speakers plus dedicated pre-out connection
• Front-panel bass and treble controls for sound shaping
• Neutral listening option by setting tone controls to center position
• Swappable dual NE5532 op-amps for users who wish to fine-tune sound character
• Compact aluminum chassis suitable for desktop or shelf placement

Specifications

• Amplifier chip: TI TPA3255
• Channels: 2.0
• Maximum output power: 300 W × 2 @ 4 Ω
• Supported speaker impedance: 2 – 8 Ω
• Inputs: Bluetooth, RCA
• Outputs: Passive speaker terminals, pre-out
• Frequency response: 20 Hz – 20 kHz (±1.2 dB)
• Total harmonic distortion: ≤ 0.005%
• Signal-to-noise ratio: ≥ 108 dB
• Bluetooth version: 5.0
• Bluetooth codecs: SBC, AAC
• Bluetooth range: up to 15 m
• Power input range: DC 24 – 48 V
• Power supply options: 32 V / 5 A or 48 V / 5 A
• Dimensions (W × D × H): 127 × 127 × 25.4 mm

What’s in the box

• Fosi Audio BT20A Pro power amplifier
• Power adapter (32 V / 5 A or 48 V / 5 A)
• Bluetooth antenna
• AC power cord
• User manual