Infinity 529I 165W (Peak) 5-1/4 -Inch Two-Way Speakers (Pair) The Kappa 52.9i 5-1/4-Inch speakers feature light, but stiff woven glass-fiber woofer cones that won't flex or distort. Plus One woofer cones This patent pending technology deliver a cone with more surface area than competing models of the same size.