. Elements of acoustical engineering. Electro-acoustics; Sound. 1000 FREQUENCY THROAT DIAPHRAGM DIAralN. AREA = AREA â SQ IN 100. t- ^ ^ >v^ ^ ^ O 20 a. \ V s s ^s . Seo <n t,uu 1000 FREQUENCY THROAT DIAPHRAGM DIAFI6 IN. AREA=20I AREA ISQ IN. 100. 201. 402. Fig. Characteristics depicting the loss in per cent of the total radiation, due to the radiation of sound from the back of the diaphragm of a horn loud speaker for diameters of 2, 4, 8 and 16 inches and throat areas of 2, 1, J, | and | times the diaphragm area. throat area to diaphragm area are sh
. Elements of acoustical engineering. Electro-acoustics; Sound. 1000 FREQUENCY THROAT DIAPHRAGM DIAralN. AREA = AREA â SQ IN 100. t- ^ ^ >v^ ^ ^ O 20 a. \ V s s ^s . Seo <n t,uu 1000 FREQUENCY THROAT DIAPHRAGM DIAFI6 IN. AREA=20I AREA ISQ IN. 100. 201. 402. Fig. Characteristics depicting the loss in per cent of the total radiation, due to the radiation of sound from the back of the diaphragm of a horn loud speaker for diameters of 2, 4, 8 and 16 inches and throat areas of 2, 1, J, | and | times the diaphragm area. throat area to diaphragm area are shown in Fig. These characteristics show that the loss is indeed quite high. Nonlinear Distortion. â In general, the power input to (or the power output of) a loud speaker is limited by the generation of spurious harmonics or subharmonics. The limiting factor may be due to air overload, excessive amplitudes where Hooke's law no longer holds, non- linear elements, variable voice coil air gap flux product or nonfundamental vibration modes of the diaphragm. It is the purpose of this section to consider the most common forms of nonlinear distortion in horn loud speakers. A. Distortion Due to Air Overload in the Horn i^, i7, i8_ â^ sound wave of large amplitude cannot be propagated in air without a change in the wave form and, as a result, the production of harmonics. If equal positive i^Rocard, Comtes Rendus, Vol. 196, p. 161, 1933. ^^ Thuras, Jenkins and O'Neil, Jour. Acous. Soc. Amer., Vol. 6, No. 3, p. 173,1935. 18 Goldstein and McLachlin, Jour. Acous. Soc. Amer., Vol. 6, No. 4, p. 275, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Olson, Harry Ferdinand, 1901-. New York, D. Van Nostrand company, inc.
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