Hello, I have a pioneer premier pro 12 I got about 700 watts going to it. and about a cubic foot box ported I do not know what its tuned to and its a circle port with a tube in it. My question is what size box do you guys recommend? Im thinking about building a new box that is slot ported. I can build as big as it needs to be. What way should I face the port? Thanks for everyones input!