Part XX: design factors affecting direct-radiator loudspeaker performance
A loudspeaker generally is designed to provide an efficient transfer of electric power into acoustic power and to effect this transfer uniformly over as wide a frequency range as possible. To accomplish this, the voice coil, diaphragm, and amplifier must be properly chosen. The choice of the elements and their effect on efficiency, directivity, and transient response are discussed here.
6.12. Magnet size
A cross-sectional sketch of a typical microspeaker is shown in Fig. 6.10. In this discussion, it is assumed that the coil fills the gap in the magnetic path without any air spaces and that it has the same permeability as free space. For the sake of argument, the ...
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