Infinity kappas will get insanely loud and stay clear. I love them. But it seems most people hate them or love them. They have some really high highs. Listen to a pair first.
LOL, infinity makes me laugh. Listen to a good set of speakers and then listen to Infinity, even their Perfects. I'd say listen to a set of CDTs, Bostons, JL, Rainbow, and Diamond and you'll notice that Infinity is not worth it and much more hype than anything. Infinitys are decent for daily cars but don't like being played out, they have screaming highs due to a fragile and junk tweeter and the mids distort horribly.