Start by selecting speakers for your car. Make sure to pick speakers that fit your needs and will fit your car. Once you're ready to install, remove the panels surrounding the speakers in your car and remove the factory speakers from the wiring harness. Then, connect the new speakers to your car's wiring and install.

If you are not technically minded, you can simply measure the cavity in your vehicle and if it matches those dimensions, you have a single DIN and you need a single DIN universal car stereo. However, some vehicles have a double-DIN.

Start by setting the crossover points according to your speaker and subwoofer specifications. Play a song with a variety of music genres and listen to how the different frequencies are distributed. Adjust the crossover points until each component is handling the frequencies that it's designed to handle.

If there are speakers currently wired up to your stereo system, fully disconnect them. Connect the amplifier output to the crossover. Using speaker wire or RCA cables (depending on your stereo system and crossover unit), connect the crossover to your amplifier just as you would a speaker.