This is what it all comes down to. The noise makers. Sized and shaped for specific vehicle applications. Kevlar, pulp, and composite cones, butyl rubber and high density foam surrounds, titanium and silk dome tweeters, integrated or seperate components, passive crossovers with air core inductors and mylar capacitors..... yep, all the good stuff. SS Audio will help you figure out what will fit your needs, car, and budget.