Morel Maximo 4C 4-Inch Coaxial Speakers 4-inch coaxial speaker kit with built-in crossover delivers 100 watts maximum power handling with 4-ohm impedance Woofers feature ferrite magnet and proprietary Acudamp cone coating for clean, linear response and increased bass dynamics 0.8-inch soft dome tweeter with a powerful neodymium magnet motor for the "sweet and warm" signature Morel sound Crossover features high-quality film capacitors for serious clarity and low distortion Highly efficient design enables the coaxial to be powered by either radio or amplifier