New loudspeakers have been developed, using honeycomb disk diaphragms, which exhibit low distortion, wide frequency range, and uniform frequency response. These characteristics are realized by using a very rigid diaphragm. The rigidity is brought about by varying the cell size of the honeycomb core in the direction of the radius and by driving the diaphragm at its first nodal circle. The result is a very desirable density gradient and equivalent Young's modulus.
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