The MTX TX665C are high-end 16.5cm diameter coaxial speakers. They support 90W RMS and 360W per pulse (it's huge ...). They have an impedance of 4 ohms to suit all amplifiers. They are equipped with the very best: MTX aluminum frame for optimal rigidity, pressed paper diaphragm for more musicality, detail and warmth, giant magnet for incredible power handling, extra-large spool in TSV TIL 30mm in diameter for details at all levels and power handling thanks to better cooling, phenomenal neodymium magnet tweeter and 28mm diameter silk dome for a smooth and dynamic sound, rubber suspension to take the large deflections while remaining reliable.