The sound comes out of the speakers or from the headphones when plugged into our keyboard/piano.

The ONE Light Keyboard has 1.25″x2 tweeters and 5″x2 woofers.

The ONE Keyboard Pro has 1.25″x2 tweeters and 2* (5×3) ” full frequency

The ONE Upright Smart Piano has 1.25″x2 tweeters and *5″*x2 woofers.