2 x 50W + 100W 2.1 Channels Bluetooth+DSP Amplifier Board – TSA7800B(Apt-X)


TSA7800B 2x50W + 100W is a 2.1 channels Bluetooth + DSP amplifier board with an AudioB I2S Bluetooth module that supports Apt-X. TSA7800B is a very flexible DSP/DAC/Amplifier combination board. It has perfect class-D architecture (based on TPA3116D2) and 2 channels have 50W power output and another one channel has 100W power output. All the channels are capable of outputting nominal power simultaneously and continuously. This board can be powered by any DC 12V-24V power supply. It can be used to drive any 4Ω or 8Ω passive speakers (subwoofer channel can drive 2Ω speaker).

The channel for subwoofer is 100W mono output (users can change the DSP program to let it becomes right or left channel). You can pair it with a mobile phone or a computer. Power up the amplifier board and use your phone or PC to search for a new Bluetooth device. The module will appear as “TSA7800B”. You don’t need a PIN, pair it up and then you can play music straightaway.

The highlight point is ADAU1701 DSP chip on board. User can set each channel audio tones separately. It offers  Apt-X and TWS support. Therefore, users can stream audio to paired amplifier boards at the same time wirelessly.

External Buttons port:

There are 3 buttons on the board which can control the audio volume and play/pause. You can connect external buttons easily by using this buttons control port.

Pins (Check the board backside silkscreen):

  • P/P: Play pause button
  • VOL+: volume increase and forward button
  • VOL-: volume decrease and rewind button
  • 1.8V

Aux in enable port:

The default DSP program combines the RCA/Bluetooth audio and output onto the amplifier chips. If you want to select the RCA/Bluetooth manually by a switch, you can connect an external switch to this port and load a different DSP program.

POT port:

User can connect an external 10K potentiometer to control the audio volume.

DSP programming port:

User can load a new DSP program by using the USBi JTAG Sigma DSP programmer

The onboard default DSP program will mix the RCA & Bluetooth audio and output to the speakers. Users can also change the DSP program to make the audio source selectable by an external switch.


2 boards work in TWS mode. You can also build a wireless subwoofer system.

  • S1 – Long press for 3 seconds to get  into pairing mode. Long press for 6 seconds to clear the pairing info.
  • S1+S2 – Long press for 1 second to get into TWS slave mode.
  • S1+S3 – Long press for 1 second to get into TWS master mode.
  • S2+S3 – Long press for 1 second to disconnect TWS connection.


Specifications typical @ +25℃, powered by 30V DC, unless otherwise noted. Specifications subject to change without notice.

Parameter Condition Min Typ Max

Supply Voltage (VDC)

12 21 24
Power output per channel RL= 4Ω, 10% THD+N 50W
RL= 8Ω, 10% THD+N 30W
RL= 4Ω, 10% THD+N 18W
100W channel: RL= 2Ω, 1% THD+N 100W
THD+N @4Ω, 1W, 1KHz 0.03%
Bandwidth @ ±3dB @4Ω 20Hz 20KHz
Input Impedance 22KΩ
Minimum Load Impedance 3.2Ω
Gain 18dB 24dB 34dB
Efficiency 50W @ 4Ohm 87% 92%


  • Size: 13.5cm x 9.2cm x 3.4cm
  • aptX, aptX Low Latency, SBC and AAC
  • Bluetooth 5.0
  • I2S Sampling Rate: 48KHz
  • 2.1 channels
  • Working voltage: DC 12V-24V
  • Over/under voltage protection
  • Over current protection
  • Over temperature protection


  • Personal computer
  • Background music system
  • Musical instrument amplifiers
  • Home DIY
  • Car audio


Additional information

* Antenna Type:

PCB Antenna, U.FL interface, SMA interface


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