Read this tip to make your life smarter, better, faster and wiser. LifeTips is the place to go when you need to know about Speaker Parts and other Speakers topics.
Speakers are designed to reproduce sound and you usually need two to three drivers 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. Many crossovers have circuitry which boosts or cuts the frequency response of the speaker.