i got to 18 inch aq hdc3 18 2ohm copper coils and i am wondering how big to make the box. i am going to buy two MB quart dsc 2000.1 for 270 each and strap them. and two deka 9g31 battery's for 180 each. these r the specs i have now. 1 inch mdf, H 22inchs , W 49 inchs , D 26 inchs. port size H 20 inchs , L 15 inch , W 6 inchs . i really do not want to go any tall but can make it longer if it is not enough room for the subs and i use the12volt.com to do the tuning and i think it is off i want like 35-38 it is going in the back of a expedition