Hey I want to build a ported box for 2 12" SDC2.5s, but I've never built a ported box....and it confuses me On the Audioque site it says each sub should have 2.5 cuft and that includes the port and sub. But what should the port length, width etc be? I've searched and read up on a lot of stuff and other peoples' builds, but still am not sure what do.