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During the Golden Age of cinema, the horn loudspeaker was perfected. To this day, horn speakers of this era made by manufacturers such as Western Electric and RCA (to name a few) are prized for their efficiency of sound reproductions and command a small fortune in collector circles.
During the 50's and 60's Horn speaker designs were reduced to the size of a large refrigerator to fit in America's living rooms. Companies like Altec, Electrovoice, and Klipsch successfully marketed horn speakers for the home. Well-designed horn loudspeaker systems are super efficient. Even today, there is a worldwide cult following for horn loudspeakers, and a huge Do-It-Yourself community of Horn Speaker builders. This speaks volumes about their efficiency.