Speakers come in two forms – Component speakers, which are the “simple” speaker, and Coaxial speakers, which are two or more speakers combined into one unit.
Component Speakers
Components usually come in kits, which include the midrange driver, tweeter, and separate crossover network. Though the components can technically be used to replace any single component of a system, they are usually sold in kits. The separation of the tweeter is to provide a better sound stage in the vehicle since they are installed on the pillars and can point more directly at our ears instead of our feet
Full-Range / Coaxial Speakers
In a Coaxial speaker setup, the tweeter is directly mounted onto the other speaker while the tweeter crossover is mounted onto the side of the speaker for added convenience. Coaxial speakers also come in different forms. These are:
2-way (has 1 speaker mounted)
3-way (has 2 speakers mounted)
4-way (has 3 speakers mounted)