PowerBass L-6705x 6.5-Inch to 6.75-Inch Coaxial 2-Way Speaker System (Pair) 180watts peake power handling 3-ohm nominal impedance 89db efficiency 62Hz - 21Khz frequency response Butyl rubber surround Advanced injection Zirconium Polypropylene Z2 cone Kit includes speaker wire mounting hardware application guide PowerBass decal Proprietary Sound Expander Lens increases tweeters dispersion 3-Ohm system impedance for extra efficiency and improved bass