hey guys, i'm a home audio guy so car audio is a little new to me but i want to buy a small system for my girlfriend. i'm just pricing right now so my question is..i don't want a sub but i do want to amp the speakers. are all amps the same type or are there sub amps and then amps for your speakers? i was ooking at an alpine 400w amp to power both the front and rear speakers. also can it be wired for stereo and not mono? thanks for your help!