Power RMS / max.60 / 120 Watts Frequency response100 Hz – 25,000 Hz Impedance4 Ω Efficiency 1 W / 1 m90 dB Cone materialTW: Coated silk dome M: – W: Coated paper CrossoverTW: Integrated, 6 dB slope W: Separate, 6 dB slope Outer diameter101.5 mm / 4.00″ Installation diameter 91 mm / 3.58″ Installation depth37.8 mm / 1.49″ 2 x Coaxial speaker MATCH UP X4BMW-FRT.3 2 x Inline crossover 1 x Instruction manual.