Speakers are designed to reproduce sound, however, you usually need multiple speakers to cover the audible range of human hearing. To have a seamless transition between subwoofer, woofer, midrange and tweeter, a crossover is used to split the sound between the different speakers. Most speaker crossovers are of the passive variety: they are mounted downstream of the amplifier and are mounted within the speaker enclosure.

Active crossovers are mounted upstream of the amplifier, and require a separate amplifier for each driver in the speaker. A speaker with a woofer, midrange, and tweeter would require three separate amplifiers if using an active crossover. Since we hear voices with the most detail, it is important to keep crossovers out of the 100 Hz to 1000 Hz range.

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