I am going to build a sealed box for a single RF stage 3 10" sub. RF says that the optimum sealed volume is like .625 cubic feet. If I use 3/4" mdf will a box with the outer measurements of 12x12x12 work. I believe that is just a little bit more than .625 but it should be close. If it makes a difference the sub will be pushed by a kicker kx400.1 at 2 ohms.