Some vehicles only have two speakers on the front, one on each door. They use a full-range design. Other vehicles have four speakers on the front, two on each side. These are usually woofers in the port and a tweeter higher up in the port or in the corner of the speaker or panel.
An example of component speaker placement. The woofer is at the bottom and the tweeter is at the top.
Many vehicles also have a center speaker on the dashboard, which typically controls essential vehicle functions such as doorbells and navigation commands, as well as playing music. Many people choose to leave the original speaker in this location.
Speakers for the rear of your vehicle – Speakers for the rear doors, rear floor, and tailgate are often full-range, although the components have become increasingly popular. The rear speakers provide sound to the rear seat passengers and “fill” the front row. Generally, the rear speakers do not contribute significantly to the sound experience in the front seats. As a result, they may be less important for drivers who don’t have passengers very often, or for sound enthusiasts who don’t want any interference from the front soundstage.