I've noticed a steady decline in the quality of Kicker Products. They are still good but you can find stuff that is better (in my opinion) for cheaper. I am a personal fan of JBL. Harman International as a whole is excellent. In my car I have 3 jbl amps and 2 infinity 10" subs. They sound ridiculous and very clear as well. Just make sure that whatever brand you purchase to always send enough power to the subs. In actuality it is better overpower the subs than to under-power them. You can always turn down the gain. Check out jbl though, they are worth listening to. Their Px series amps look really cool too.