Full Range: Component:
Most speakers are 2-ways, or coaxials with a single tweeter mounted above the cone of its woofer. A 3-way adds an additional driver for improved clarity and a 4-way adds a supertweeter for even more detailed high frequency response. The separate woofers, tweeters, and crossovers in a component system give you better performance than most 2- or 3-way full-range speakers. When audio perfection is what you crave, component speakers are a must.
Subwoofers:  
No car audio system is complete without bass. A quality subwoofer will add a solid foundation of bass and depth to any type of music.