DescriptionEarly 1920s radio and horn speaker.png English: A drawing of an early vacuum tube regenerative radio receiver and horn loudspeaker, the Paragon...
DescriptionMoving-iron cone speaker 1929.png English: Early Paratone cone loudspeaker from advertisement in 1929 radio magazine. Loudspeakers that used...
loudspeaker.png English: Westinghouse Vocarola loudspeaker, an early radio loudspeaker sold between January 1922 and September 1923. Like most early speakers it...
