loudspeaker diagnosis

Those who need to understand the underlying theory of the working of moving-coil loudspeakers usually try to read authoritative textbooks (which tend to be thick ones). Many others who really would like to understand are frightened off by these authoritative textbooks. The present short article, intended to accompany the `electronic loud- speaker` in this issue, outlines the way in which a knowledge of the basics of electrical engineering can give access to the `mysteries of the moving-coil`.