I just bought a box for two tens for a f150 reg cab, so the box is small. It only has one terminal in the back and the two positives and two negatives for each speaker are ran to this terminal. I dont know what subs to buy for this box or what kind of amp. Is this running the speakers in series like this? Should I buy a single channel amp or dual? Also it is a mtx thunderform box....Does anyone know they sound like crap or not? Im new to this and need help.