I am installing a small system in a 2013 F150 4 door and they are giving me 500 dollars. I have been thinking of doing 2 10s in a prefab (explained the difference and they didn't want to spend the cash for a really well built custom under-seat box). I have been thinking of the Pioneer TS-sw250 Series shallow mount 250w rms subs, only come in single 4. But two of those with the box only is 90 dollars alone. Subs are 180 together, I still need the wiring, LOC, and amplifier. I was thinking for an amplifier to get like a PPI i650.1 or a Rockford 500 Prime series. Any suggestions other than this? This has to be used, they don't want used equipment.