CS-Series 4-inch Coaxial Speakers deliver accuracy, durability and a factory fit. These coaxial speakers are a significant upgrade in your sound. 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. These CS speakers work best with 50 watts of continuous power.