i am from mexico city, i am 16, and i don´t now a lot about car audio, i have an altima 99 and i have an alpine multimedia head unit, dvd, one amplifier mtx 600w, 1 amplifier planet audi 400w, a cd changer of 12 discs, 1 subwoofer planet audio 12 ", 4 mid components mtx, 4 tweeters, but i am...