Ok so i have 4 15'' power hx2 the box design i have is 14.25 cubic feet, ported. im going to have about 4500rms going to them. with big3 and 275 amp alt. im wondering how many and what kind of batts i should run and what hz. i should tune the box too. id like to have good but not to expensive batts. and if you have any other input help me out. In 2001 s10 blazer and dose anyone have an idea on what db this would hit in the back of a s10 blazer?