The MTX TX669C are high-end 16x23cm (6x9") coaxial speakers. They handle 120W RMS and 480W per pulse (that's huge ...). They have a 4 ohm impedance to accommodate to all amplifiers. They are equipped with the very best: MTX aluminum frame for optimal rigidity, pressed paper membrane for more musicality, detail and warmth, giant magnet for incredible power handling, extra-large 35mm diameter TSV TIL voice coil for all-round detail and power handling thanks to improved cooling, phenomenal neodymium magnet tweeter and 28mm diameter silk dome for smooth, dynamic sound , rubber suspension to handle the large deflections.