The ESP32-LyraT is a hardware platform designed for the dual-core ESP32 audio applications, e.g., Wi-Fi or Bluetooth audio speakers, speech-based remote controllers, connected smart-home appliances with one or more audio functionality, etc.
The ESP32-LyraT is a stereo audio board. If you are looking for a mono audio board, intended for lower end applications, check ESP32-LyraT-Mini.