Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 NONLINEAR DISTORTION 163 F. Power Handling Capacity and the Voice Coil Temperature'^^. —The maximum allowable distortion may determine the power rating for the loud speaker. However, in certain loud speakers the maximum allowable temperature of the voice coil determines the power rating. This is par- ticularly true of high frequency loud speakers. By m^aking the efficiency a maximum, the dissipation in, and the resulting temperature of, the voice coil for a certain acoustic output wi
Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 NONLINEAR DISTORTION 163 F. Power Handling Capacity and the Voice Coil Temperature'^^. —The maximum allowable distortion may determine the power rating for the loud speaker. However, in certain loud speakers the maximum allowable temperature of the voice coil determines the power rating. This is par- ticularly true of high frequency loud speakers. By m^aking the efficiency a maximum, the dissipation in, and the resulting temperature of, the voice coil for a certain acoustic output will be a min- imum. Practically all the heat energy developed in the voice coil is transmitted across the thin air film between the voice coil and the pole POWER INPUT Fig. The temperature rise as a function of the power delivered to a voice coil for air gap clearances as follows: A. inch, B. inch, C. inch. Coil IJinch in diameter and inch in length. pieces, and from the pole pieces to the field structure and thence into the surrounding air. In this heat circuit practically all the drop in temper- ature occurs in the thin air film. The temperature of the voice coil approaches the temperature of the pole pieces as the thickness of the air film is decreased. The temperature rises as a function of the power dis- sipated in the voice coil for various clearances between the voice coil and pole pieces is shown in Fig, These results are obtained for no motion of the voice coil. When motion occurs, the thermal impedance of the air film is reduced and the temperature of the voice coil is diminished. 24 Olson, H. F., RCA Review, Vol. 2. No. 2, p. 265, 1937.
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