so right now i have 1 alpine type r 12 in a 1.5 net cubic foot box tuned to 27hz. I have a hifonics 1000.1d amp that makes 750 at 2 ohm and 1000watts at 1 ohm. so now i want to buy another type r and run 500watts to each. could someone design a box for me that would fit in my 97 gtp?