A '''compression driver''' is a typesmall ofspecialized diaphragm [[loudspeaker]] driver which usesprovides the techniquesound offor "compression"a [[horn loudspeaker]]. It is attached to achievean high[[acoustic efficiencies.horn]], Ina thiswidening contextduct compressionwhich refersserves to radiate the factsound thatefficiently into the air. It works in a "compression" mode; the area of the loudspeaker diaphragm is significantly larger than the throat aperture through whichof the soundhorn isso radiated.that Compressionit driversprovides arehigh mostsound commonlypressures. used attached to [[Horn (acoustic)|acoustical horn]]s to make a [[horn loudspeaker]]. Horn-loaded compression drivers can achieve extremely high efficiencies compared to direct-radiating cone loudspeakers. They are used as [[midrange driver|midrange]] and [[tweeter]] drivers in high power sound reinforcement [[loudspeaker]]s, and in reflex or folded-horn loudspeakers in [[megaphone]]s and [[public address systems]].
