Here is ThePianoforever PX-S3000 discussion and brief review at NAMM 2020. He does a brief demo of the piano by playing Beethoven's 3rd movement of the Moonlight Sonata. In addition to the speakers in the back, there are two slotted ports in the front just above the keybed. They are more subtle and located on the left and right side, but they are there and project some sound toward the user.
He plans to do a more extensive review within the next 10 days or so.