JBL Stage1 51F 5.25" 2-Way Coaxial Car Shelf Door SpeakersFor most brands, off the shelf speakers and a cursory approval of frequency response curves are good enough. Thats not the case with JBL. We dont only listen to our speakers against the competition we voice them against each other to ensure each line has the consistent JBL sound signature thats known and sought out by those who care about their audio. This is just part of an extensive development process undertaken by some of the best transducer