Skip to product information
1 of 7

Fosi Audio

Fosi Audio BS-A1 4.0 Channel Mini Amplifier Bluetooth 5.0 HiFi Class D Amp USB Player 50W X4

Regular price $89.99 USD
Regular price Sale price $89.99 USD
Sale Sold out
Shipping calculated at checkout.
  • Fosi Audio BS-A1 Bluetooth stereo receiver amplifier support Bluetooth, RCA, and USB input, is compatible with your existing stereo equipment, and provides exceptional sound quality.

  • Product Size: 5.12 inch X 1.38 inch X 5.12 inch. Simple compact design but practical and powerful. Stream Hi-Fi music to your home audio stereo system.

  • 4.0 CH Unique Design. With a select switch, this little amp can drive 2 passive speakers and 2 powered/active speakers at the same time in the RCA mode.

  • Small but Professional. Adopted Fosi Audio advanced BS-A1 power amplifier chip. RMS 50W X 4 output. THD: ≤ 0.01%. Frequency Range: 20Hz - 20kHz (±3 dB). SNR: ≥ 105 dB. Input sensitivity: ≤ 200mV.

  • What You Get: BS-A1 Amp, 24V/4.5A power adapter, AC cord, user manual, 18-Month global warranty, and 24-Hour quick customer service.


  1. Power supply range: DC 12v-24V;

  2. THD: ≤ 0.01%;

  3. Frequency Range: 20Hz - 20kHz (±3 dB);

  4. SNR: ≥ 105 dB;

  5. Input sensitivity: ≤ 200mV;

  6. Terminating impedance: 2Ohm - 8Ohm;

  7. Output power: 50W*4;

  8. Input: RCA/Bluetooth/USB;

  9. Power supply: 24V 4.5A;


  • 1*BS-A1 Amplifier

  • 1*AC cord

  • 1*24V 4.5A Power Supply

  • 1*User Manual