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Passive Crossovers are most common in speakers today because they can be mounted directly in a speaker cabinet and can work with almost any amplifier or receiver. These speakers separate the sound coming from the amplifier and direct it to the appropriate driver within the speaker.
Passive crossovers are comprised of capacitors and coils, and may sometimes incorporate a switch or knob to change the output level of a tweeter or midrange speaker in relation to the woofer. Passive crossovers do their job well and the designer has total control.