Most factory-installed (OEM) car speakers are full-range drivers designed to produce a wider range of frequencies (from highs to lows). Unlike OEM car speakers, an upgraded car stereo speaker set will have drivers solely dedicated to producing high frequencies known as tweeters. With tweeters, you’ll enjoy superior sound over stock. Most OEM car speakers use an economical paper tweeter, while most upgraded speakers have tweeters made of poly or silk which improves treble output and sounds smoother overall. When you’re browsing through our online car stereo equipment options, consider adding an amp and sub for incredible added impact.