hi, i read these forums often for advice but this is my first time posting.. im trying to sell my current system witch is 2 spl-sp3 12's in a ported box with a 2000watt boss phantom amp and a 5 farad power cap. im looking to get 2 sundown sa-12's with ether an aq 2200d or a crescendo bc2000 probably the AQ but anyways back to the main point.. i went to a local place called custom whipz to ask about a custom box but they said they would need the space requirements for the subs and im not sure what they are.. so if anyone has the specs for a good ported box for 2 sa-12's i would really appreciate it! also is it a good upgrade from my current system? i think its a huge upgrade but would love your input. thanks everyone