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- W4244116230 abstract "Two sources of non-linear distortion in a dynamic loudspeaker are considered in this discussion; both are related to the magnetic characteristics of the driving mechanism. The first type of distortion arises due to a force of attraction between the voice coil, carrying a current, and the iron of the field structure. This force varies as the square of the current and produces second harmonic distortion. The force may be related to the space rate of change of self-inductance of the voice coil as it moves in the air gap. The magnitude of the distortion produced in this way may be several tenths of one percent, and is greater for low frequencies and large currents. This distortion may be reduced by proper proportioning of the voice coil and field structure, and by using a short-circuited winding on the field structure. The second type of distortion arises due to non-uniformity of the magnetic field in which the voice coil moves. This effect is well known qualitatively, but equations are given here for its quantitative evaluation. These equations indicate that the distortion characteristically is less than one percent, and is greater for large amplitudes of motion. If the voice coil is centered in a symmetrical field, only odd-order distortion is produced. If the field is not symmetrical about the voice coil, even-order distortion is also present. This distortion may be reduced by proportioning the voice coil and field structure so that the mean field in which the coil moves remains as constant as possible." @default.
- W4244116230 created "2022-05-12" @default.
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- W4244116230 date "1949-07-01" @default.
- W4244116230 modified "2023-09-30" @default.
- W4244116230 title "Non-Linear Distortion in Dynamic Loudspeakers Due to Magnetic Effects" @default.
- W4244116230 doi "https://doi.org/10.1121/1.1917070" @default.
- W4244116230 hasPublicationYear "1949" @default.
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