Polk Audio MM651 6.5 Inches Coaxial Loudspeaker- Black Overall Frequency Response - 40-25kHz; Nominal Impedance - 2.7 ohms; Power Handling (continuous) - 100 w; Power Handling (peak) - 200 w; Efficiency - 94 dB Neodymium Magnets a rare earth metal offering exceptional strength to performance ratio, saves tremendous weight Carbon Composite Basket based on the spokes of a wheel is lightweight, will not flex during peaks and looks great Woven Glass Composite Cones feature tremendous stiffness-tomass ratio. Lower mass means faster transients and finer detail. Large-Diameter Voice Coils (30mm) in drivers increase reliability and power handling capacity.