PREFACE
In our second chapter on loudspeakers, the great diversity in their design is explored, and the construction of both moving-coil and electrostatic loudspeakers is gone into in more detail.
We begin with the familiar moving-coil loudspeaker. The vast majority in use today are of this type, in which a voice-coil, fixed to the cone and carrying the audio signal, moves in a static magnetic field. Their development has continued steadily over the last 90 years or so, but they still retain some inherent limitations, as do all electroacoustic transducers. The earliest moving-coil speakers had their magnetic field generated by an electromagnet, as adequately powerful permanent magnets simply did not exist, and this meant that every loudspeaker ...
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