I bought this little amplifier for my portable system with JBL Control 1 Pro speaker. It is incredible what this little amp can do, it makes declared 30W with the 19Vdc power supply. I posted a review at ASR:
https://www.audiosciencereview.com/forum/index.php?threads/wondom-aa-ab31471-1-x-30-watt-class-d-amplifier-board-review-and-measurements.46972/