Earthquake VTEK Xtreme Impedance Series coaxial speakers were designed with an emphasis on OEM applications to install precision, high-quality aftermarket speakers in factory-upgraded vehicles. The 5×7-inch VTEK-57Xi delivers quality and performance while eliminating the need to buy overpriced replacement speakers from the vehicle or audio manufacturer. Earthquakes VTEK speakers cost less, perform better, and will reach you in less time. With several features that enhance sound quality, performance, and protection, the VTEK-57Xi delivers the best OEM sound possible at the best price possible. Features such as glass fiber cone bodies for faster and more accurate dynamic responses, die-cast aluminum baskets for additional self-cooling, PistonMax drive technology for higher sound quality plus quantity, and 20mm swiveling silk dome Neodymium tweeters result in the smoothest, highest, and most precise highs possible.