Re: Why are speakers elliptical?
Hartley 118 Re "who first thought of using a cone "
My undertsanding was that the first electrodynamic cone loudspeaker was invented in 1925 at General Electric laboratories in Schenectady, New York by Edward W. Kellogg and Chester W. Rice. It may be of course that their patent was to combine a moving coil motor with a conical diaphragm. There may have been earlier cones driven by moving iron motors.
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