Planet Audio BB625C 6-1/2-Inch 2-Way Component Speaker System Power Handling (Peak) 200W , Power Handling (Continuous) 100W , Frequency Response 35Hz-20Khz , Crossover Slope @ 4.5Khz 18Db/Octave , Efficiency (1 Watt/1 Meter) 91 Db , Impedance 4 Ohm . Silver Glass-Fiber Woofer Cone Patented Crs (Cloth Reinforced Santoprene) Surround Open Design-Inch Stamped Basket 1-Inch Black Anodized Aluminum Voice Coil Former 1-Inch Silk Soft Dome Tweeters With Neodymium Magnets 18Db Passive Crossover Custom Tooled Grilles 6.5-Inch 2-Way Component Speaker System