2-Way Component System: 6.5-inch (165 mm) Woofer 0.75-inch (19 mm) Silk Dome Tweeter The Evolution C2 systems deliver sparkling high-frequency detail smooth mid-range and powerful mid-bass thanks to real silk dome tweeters and long linear excursion woofer designs. The C2-650 ...2-Way Component System: 6.5-inch (165 mm) Woofer 0.75-inch (19 mm) Silk Dome Tweeter The Evolution C2 systems deliver sparkling high-frequency detail smooth mid-range and powerful mid-bass thanks to real silk dome tweeters and long linear excursion woofer designs. The C2-650 system features 6.5-inch (165 mm) component woofers with mineral-filled polypropylene cones long excursion capabilities and stamped steel frames.