Hertz DCX 570.3 car audio coaxial features a neodymium magnet, PEI dome tweeter, built-in crossover, TPU (Thermoplastic polyurethane) surround and a copper mobile voice coil wound on conex former. An extremely light, yet stiff structure ensures linear frequency response and a high sensitivity level. This 2-way coax speaker is designed to satisfy specific installation and listening needs.