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The 1925 paper [1] of Chester W. Rice and Edward W. Kellogg, fueled by advances in radio and electronics, increased interest in direct radiator loudspeakers. In 1930, A. J. Thuras of Bell Labs patented (US Patent No. 1869178) his "Sound Translating Device" (essentially a vented box) which was evidence of the interest in many types of enclosure design at the time.
Because of their tendency to attract dust, insects, conductive particles, and moisture, electrostatic speaker diaphragms will gradually deteriorate and need periodic replacement. They also need protection measures to physically isolate their high voltage parts from accidental contact with humans and pets.
The term loudspeaker may refer to individual transducers (also known as drivers) or to complete speaker systems consisting of an enclosure and one or more drivers.. To adequately and accurately reproduce a wide range of frequencies with even coverage, most loudspeaker systems employ more than one driver, particularly for higher sound pressure level (SPL) or maximum accuracy.
At Cambridge-based KLH, Kloss continued to build speakers such as the classic KLH Model Five and Six, and produced one of the first small FM radios with high selectivity, the Model Eight. The KLH Nine was the world's first full range (flat from 40 Hz - 20 kHz) electrostatic loudspeaker (1960). The tweeter was mounted near the middle, with ten ...
A passive radiator speaker uses a second passive driver, or drone, to produce similar low-frequency extension, or efficiency increase, or enclosure size reduction, similar to ported enclosures. Small [28] [29] and Hurlburt [30] have published the results of research into the analysis and design of passive-radiator loudspeaker systems. The ...
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