JL AUDIO TR690-TXI COAXIAL 3-WAY SPEAKERS 6"x 9": Evolution Tr 6" X 9" 3-Way Speakers; Woofer-Injection-Molded, Mica-Filled, Polypropylene Cone Body; Butyl Rubber Surround; 1.25" Voice Coil On Kapton Former Flat; Ferrite Magnet; Symmetrical Roll Spider; Tweeter-0.50" Textile Dome Tweeter; Ferro Fluid Cooling / Damping; 60W Rms; Impedance 4 Ohm; Polypropylene Cone; Butyl Rubber Surround; .5" Tweeter / 2" Midrange / 6X9" Woofer.