how many db's increase would I see if I went from a sealed to a ported box. I know it's probably a tough question to answer but I'm just wondering if it's worth the switch and would the average person notice the difference in spl or sq just for info I have two 12" Infinity reference 1230w JVC KD-G310 HU Rockford Fosgate P3001 amp at 2 ohms ESA 100w RMS (2*55W)2 channel crappy amp for front 6.5"s