Guaranteed legitimate and authentic merchandise The CS Series delivers remarkable performance and ultra-clean bass, utilizing a heavy-duty motor/magnet structure featuring EVC (Extended Voice Coil) technology not found in stock speakers. They use polypropylene cones with tough, ribbed, UV-treated surrounds for precise linear excursion and reliability. CS-Series 6-3/4-inch Coaxial Speakers are the perfect way to upgrade your factory speakers. CS-Series Coaxials deliver remarkable performance and ultra-clean bass with a heavy-duty motor/magnet structure not found in stock speakers. The stamped-steel framework supports a rigid polypropylene cone with EVC (Extended Voice Coil) technology for the best sonic quality. Using zero-protrusion PEI tweeters with neodymium magnets, you get the clarity you need without interfering with factory grilles. These CS speakers work best with 100 watts of recommended power.