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He also invented the paper cone loudspeaker which is used in most radios now.
Moving iron cone loudspeakers appeared around 1920.
In contrast, a modern electrodynamic cone loudspeaker is a low impedance device, with higher current requirements.
Horn-loaded compression drivers can achieve very high efficiencies, around 10 times the efficiency of direct-radiating cone loudspeakers.
The dynamic cone loudspeaker invented in 1924 greatly improved audio frequency response over the previous horn speakers, allowing music to be reproduced with good fidelity.
When paper cone loudspeaker drivers were introduced in the mid 1920s, radio cabinets began to be made larger to enclose both the electronics and the loudspeaker.
The patent described what was later known as the coaxial speaker, incorporating a small high frequency horn with its own diaphragm set inside a large cone loudspeaker.
Around 1930 they were replaced by the moving coil cone loudspeaker developed in 1925 by Edward Kellogg and Chester Rice.
Due to the development in recent decades of more efficient cone loudspeakers, which have a flatter frequency response, use of horn speakers in high fidelity audio systems has declined.
This used a Goodmans Axiom 150 cone loudspeaker for the lower frequencies and an electromagnetic ribbon loudspeaker, designed by Acoustical, for the higher frequencies.
It offers very wide dispersion allowing the CT8B to be placed further apart than conventional loudspeakers therefore reducing the quantity required when compared to conventional narrow dispersion cone loudspeaker.
A compression driver is a small specialized diaphragm loudspeaker which generates the sound in a horn loudspeaker.