Hi,
My upcoming car setup for my bmw is a JVC headunit, Rockford fosgate T20001 bd amplifier and maybe 1 Rockford T1 or T2 15" or 2 Rockford T1 or T2 12" subs, by the way what is better 1 15" or 2 12"? where do i get more bang for the buck? but my main question is, do i need to upgrade anything...