I have a 1994 ford ranger extended cab with 2, Phoenix gold dual voice coil 350 watt rms 12's with a Clarion 400 watt amp.The subs are wired series paralell in two seperate ported boxes.With a mobile spec 1 farad Cap.The problem is it just dosent hit like i imagined...my punch z 12's hit harder in my car with a smaller box....Is this normal or is something not right??