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The 4-inch speakers that come off the assembly line in a new compact vehicle or an older Lexus or BMW are usually ripe for replacement after a few years of use. Moreover, it often leads to better sound quality than you’ve known previously, because you can replace the old, manufacturer-installed models with higher quality 4-inch speakers.

Some new car owners don’t even wait until the factory-installed speakers wear out before replacing them with better models. Reliable sellers on eBay offer two-way coaxial speakers from Alpine, JBL, Fusion, Pioneer, BOSS and other top names, as well as component, rear-hatch speakers of 4 by 6 inches to complement four-way sound that provides a clarity and fullness that factory audio can’t match.