The CM6.1Si comes with a 6-1/2 polypropylene woofer with a foam surround and dual 3/4 Kaladex(R)

The CM6.1Si comes with a 6-1/2 polypropylene woofer with a foam surround and dual 3/4 Kaladex(R) tweeters. Both the CM6.3Si and CM6.5Si have a 6-1/2 mica-filled polypropylene woofer with rubber surround. The CM6.3Si has dual Kaladex(R) tweeters, and dual no-strip speaker wire terminals; while the CM6.5Si comes with dual 3/4 fluid-cooled ultra-wide dispersion tri-laminated Teteron tweeters, dual no-strip speaker wire terminals and an advanced crossover network including bass and treble controls. The CM8.5Si features an 8 polypropylene woofer with butyl rubber surround, and also features dual 3/4 fluid-cooled ultra-wide dispersion tri-laminated Teteron tweeters, dual no-strip speaker wire terminals and an advanced crossover network including bass and treble controls.