Principle 2 way coaxial system Power Handling 45 / 90 Watts Impedance 4 ohms Frequency response 55 - 21.000 Hz Crossover Frequencies 4000 Hz Sound pressure level 90 dB DIN-Diameter 4" woofer, 0,5" tweeter Outer diameter 135 mm Cutting Out 94 mm Mounting depth 15 mm Cone material Woofer: coated polypropylene cone Tweeter: Polycarbonate Highlights Warp resistant, low-resonance steel basket Embossed polypropylene cone for less distortion listening Additional voice-coil ventilation for better power handling and less mechanical damping Tweeter with acoustic equalizer and neodymium drive External crossover with PTC tweeter protection Designer loudspeaker covers