Larry, not an audiophile guy here, but there's a mid range speaker in keyboard speakers, from what I've been told, similar to headphones.


"Bi-amping" is the use of two channels of amplification to power each loudspeaker within an audio system. "Tri-amping" is the practice of connecting three channels of amplification to a loudspeaker unit: one to power the bass driver (woofer), one to power the mid-range and the third to power the treble driver (tweeter). The terms derive from the prefix bi- meaning 'two', tri- meaning 'three', and amp the abbreviation for "amplifier".