ok um well im getting the chevy colorado extended cab next year glad i decided,but heres were yalls oppinions come in im getting a 1200 rms amp,was planning on getting a 15 inch sub 1500rms in 4 cubes ported at 34 hz,but im short on room really it says for sealed get 2 cubes,how much overall volume do u thank i would loose going from ported to sealed,and lows how bad would i loose them i heard ported brings out the lows big time.