PREFACE
Finally , the fourth chapter in this section on loudspeakers deals with the crossover units that direct the appropriate frequencies to the high-frequency and low-frequency units of a multi-way loudspeaker system.
There are two kinds of crossover: passive and active. Passive crossovers deal with the signal after it has left a single power amplifier, and must therefore be able to handle large voltages and currents. An active crossover uses a separate power amplifier for each driver unit, and the division of the audio spectrum is done before these amplifiers, using circuitry working at preamp signal levels. A passive crossover is clearly a much simpler affair, using a relatively small number of components, but paradoxically its design ...
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