The CS triaxial (three-way) speakers are an excellent factory upgrade. A stamped steel framework supports a rigid polypropylene cone with EVC (Extended Voice Coil) technology, for the best sonic quality. Using zero protrusion PEI tweeters ensures you get every bit of clarity you need, without interfering with factory grilles. Adding a CX amplifier will give even more power and clarity to your system.Geek Squad® Installation RecommendedVisit your local Best Buy store for more information.