Right now I'm running 4 Alpine Type-R SPR-17LP on a 40w x 4 Alpine amp..Would it be considered an upgrade to put the Infinity Kappa Perfect 6.1 component set up front and the Infinity KAPPA 63.7I in back? I have heard some say that Infinity is harsh sounding, and not very bassy..I would like more bassy sound than a harsh trebley sounding speaker...anyone owned either of these speakers?? The Alpines I have now sound great at lower volumes, but they are not clear at all when turned up, they are way too distorted..These would be the two I am debating between, but if someone has a better speaker for the money...I'm looking at spending about 280-300 for both front and rear together...Thanks!