The PA-AS connects to any Pa4X providing a full, robust sound. Mid and treble speakers face the performer, placed to the outside edge so they will not be blocked by your songbook or scores. Facing down is the reflex-loaded subwoofer, providing an encompassing bass sound. The speaker mounts on top of the keyboard, and uses Korg's Easy Connect System for a cable-free connection. The PA-AS speaker system delivers high quality audio at home or for monitoring applications on stage.