ok i got two 12' sony xplod speakers that are 1300 watts max n bout 380 rms and i got a cheap amp that is 2 channel and puts out about 600 watts max.i was wondering if i should go wit a ported or sealed box? and if i do go with ported i was going to go wit the design of box with the speakers facing up and the ports facing back. i got a 91 4 door blazer and i was reading that most people with trucks say that design of a box goes good