I tried to build up a Bluetooth-Speaker based on the A2DP_Sink_Example from Espressif. I connected a PCM5102 DAC and a TPA3116 amplifier (both from TI) and integrated everything into a cheap bookshelf-speaker. I did the frequency X-Over for the woofer and the tweeter digitally inside the ESP32 with the help of IIR filters.
For more information please watch my YouTube video: https://youtu.be/_nCOluMHfGI