Infinity Kappa 63XF Kappa Series 6-1/2" 2-Way Car Speakers (Pair) Infinity designed and built their Kappa Series for audiophile tastes. These Kappa 63XF 6-1/2" car speakers benefit from a refined design, Infinity's proprietary technology, and premium materials to deliver uncompromised audio quality. Plus, Infinity has added convenient features for getting just the right sound for your ride. Infinity employs an edge-driven design in their silk dome tweeters for a smoother, more open response and