How to Install Car Audio Crossovers

Written by william kinsey
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How to Install Car Audio Crossovers
Subwoofer and midrange speaker (speaker image by Byron Moore from

Audio speakers come in an array of sizes. Large speakers, such as subwoofers, are designed to handle low frequencies, such as 40 hertz to 250 hertz. Tweeters are small speakers designed to handle the very high frequencies, such as 10 kilohertz and higher. The frequency band containing voice is called the midband. This range runs from 250 hertz to about 10 kHz. To make sure the right frequencies go to the correct speakers, crossover circuits were created. Crossovers are designed to be connected after the head unit (radio, CD player) and before the amplifier or speaker.

Skill level:
Moderately Easy

Things you need

  • Screwdriver
  • Wire strippers

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  1. 1

    Look at the crossover. The crossover has an input and an output side. The input will run back to the head unit. The output is usually divided into low, mid and high bands. Lows will be routed to the subwoofers, mids will go to the mid-range speakers, and highs will go to the tweeters or high-range speakers.

  2. 2

    Strip 1/4 inch of insulation off of the speaker wires coming from the head unit. Crossovers usually have screw-type connectors. At the crossover input, connect the left speaker positive wire to the left speaker positive input on the crossover and tighten using a screwdriver. Connect the left speaker negative wire to the left negative input on the crossover. Repeat this process for the right speaker wires using the right inputs on the crossover.

  3. 3

    Connect the low positive and the low negative terminals on the output side of the crossover to the positive and negative terminals on the subwoofer or the input side of the amplifier supplying power to the subwoofer. Connect the high positive and high negative terminals on the output side of the crossover to the tweeter speakers or the amplifier supplying the tweeters. Repeat this process for the midrange output of the crossover.

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