Powerbass L6502X Powerbass 6.5-Inch Coxial Speakers 180watts peak power handling 3-ohm nominal impedance 88db efficiency 59Hz - 21Khz frequency response Butyl rubber surround Advanced injection Zirconium Polypropylene Z2 cone Kit includes mesh wire grills 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 180watts peake power handling 3-ohm nominal impedance 88db efficiency 59Hz - 21Khz frequency response Butyl rubber surround Advanced injection Zirconium Polypropylene Z2 cone Kit includes mesh wire grills 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