I just bought 2 sets of Infinity Kappa 652.5i speakers and they come with an external cross-over. On the directions it says to connect the cross-over wires to an external amp...problem is...i don't have an amp. Is it possible to hook these speakers up w/o the cross-overs? Or, if I want to hook the cross-overs up, what accesories do I need to hook them up to my Kenwood deck? Thanks!

Ryan