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Acoustics: Sound Fields, Transducers and Vibration, 2nd Edition by Tim Mellow, Leo Beranek

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Part XXV: Multiple drive units

7.20. Crossover filters

Many high-fidelity sound systems employ two or more loudspeaker drive units. One, called a woofer, covers the low-frequency range, whereas the other, called a tweeter, covers the high-frequency range. Sometimes, a third unit or squawker is included to cover the midrange. An electrical network, called a crossover network, is used to divide the output energy from the amplifier into the different frequency regions covered by the multiple drive units. Here, we shall concentrate on two-way crossovers as the same rules can be applied when designing loudspeakers with three or more drive units.

Classical crossover filters

Fig. 7.44 shows an outline schematic of a two-way loudspeaker ...

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