PERMANENT MAGNET LOUDSPEAKERS
The most popular type of loudspeaker today is the permanent magnet dynamic type. Because of its comparative simplicity of construction and design, the precision that may be built into it, the ease with which it is interfaced with other equipment, its easy adaptability to many different applications, and its comparative freedom from electrical trouble, the dynamic loudspeaker has found acceptance in all kinds of reproducing systems. It is found in the smallest pocket radios and is a major component of the most elaborate theatre systems (See Fig. 4.8).
Just about all hi-fi woofers are of the permanent magnet (PM) type. Exploded view of the PM cone type speaker is given in Fig. 4.9. The cone (diaphragm) is energised ...
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