Planet Audio BB65PRO 6-1/2-Inch PRO Series 2-Way Component Speaker System Power Handling (Peak) 300W , Power Handling (Continuous) 150W , Frequency Response 25Hz-22Khz , Crossover Slope @ 4.5Khz 24Db/Octave , Efficiency (1 Watt/1 Meter) 93 Db , Impedance 4 Ohm . 3-Inch Black Anodized Aluminum Voice Coil Former  Woven Tinsel Leads 1-Inch Silk Soft Dome Tweeters With Neodymium Magnets  24Db Passive Crossover Network With Tweeter Protection Circuit