![]() A parabolic reflector type of loudspeaker must have a diameter twice that of the wavelength of the lowest desired frequency, so to obtain directional control of frequencies down to 20 Hz, the dish would have to be over 113 feet (34 m) wide. The lowest frequency that can be directed into a narrow beam is dependent on the size of the parabolic dish. The sound is bounced off the parabolic dish and leaves the dish focused in plane waves. In a parabolic reflecting loudspeaker, one or more speaker drivers are mounted at the focal point of a parabola, pointing away from the audience, toward the parabolic surface. ![]() The focused waves of a parabolic loudspeaker tend to dissipate in air at about 3 dB SPL per doubling of distance, rather than the usual 6 dB of conventional loudspeakers. ![]() The parabolic loudspeaker has been used for such diverse purposes as directing sound at faraway targets in performing arts centers and stadia, for industrial testing, for intimate listening at museum exhibits, and as a sonic weapon.Ī parabolic loudspeaker can send sound farther than traditional loudspeaker designs. The resulting beam of sound travels farther, with less dissipation in air, than horn loudspeakers, and can be more focused than line array loudspeakers allowing sound to be sent to isolated audience targets. Parabolic-shaped speaker producing coherent plane wavesĪ parabolic loudspeaker is a loudspeaker which seeks to focus its sound in coherent plane waves either by reflecting sound output from a speaker driver to a parabolic reflector aimed at the target audience, or by arraying drivers on a parabolic surface.
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