TSA8804 is a 4x100W Stereo Bluetooth 5 multipoint audio amplifier board. It has perfect class-D architecture(Based on TDA7498E) and each channel has maximum 100W power output. All channels are capable of outputting nominal power simultaneously and continuously. This board can be powered by any DC14V-36V power supply. it can be used to drive any 4Ω or 8Ω passive speakers. The highlight point is BT 5 integrated. You can have many TSA8804 boards paired and work together. TSA8804 can remember the pairing info. You don't need to pair them each time after you turn the amplifier board on. This make it possible to build a wireless surround sound system by using the TSA8804. TSA8804 has a ADAU1701 DSP chip on board. It has a default DSP program loaded. Customers can adjust the gain, bass, midrange and treble in the DSP program. It also has a debug port for Sigima Studio, and user can program this module with our USBi programmer to get more functions that include equalization, crossover, bass enhancement, multiband dynamics processing, delay compensation, etc... If you only use one TSA8804, it can work as a common Bluetooth amplifier board. Power the amplifier board. Double click PAIR button to set the board into Pairing mode. Use your phone or PC (etc) to search for a new Bluetooth device. The module will appears as "TSA8804". You don't need a PIN, pair it and then you can play music. Pairing buttons: PAIR - Double click into pairing mode. TX - Click into transimitter mode. RX - Click into receiver mode.   One board works like a normal Bluetooth amplifier   Multiple boards work together   How to use: Master board: Power up the TSA8804, Blue LED slow blinks. (Voice: Power ON) Double click PAIR button to set the TSA8804 into Pairing mode. Blue LED fast blinks. (Voice: Pairing) Now, your smartphone will be able to find a new Bluetooth device whose name is "TSA8804". Connect it. (Voice: Pairing successful) You can play the music now. If you only use one amplifier board. Yo