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Guatemala Much Better Able Than Cone Crushers

Jun 06, 2019 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

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