Reference

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Irving M. Fried  |  Jun 06, 2019  |  First Published: Sep 01, 1962  |  16 comments
Ever since the first electrical loudspeaker—a glorified headphone with a horn on it—was outmoded by the balanced-armature cone speaker, paper has been the standard diaphragm material for speakers reproducing low frequencies. The Rice-Kellogg moving-coil transducer replaced the balanced-armature driving system in 1925, but the paper cone remained. And although many improvements have since been made, were no more major changes in loudspeaker design for over 30 years!

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