I've got a twinkling in my brain about building my own bass cab. Never done it before. I realize there's a lot to learn. It would be something small, probably a single 10 or 12 in a kickback/wedge sort of design. My question is, should a noob even consider a ported design? I'm a little intimidated by figuring the port thing out. Figuring out the right volume of air behind a speaker in a sealed cab seems doable with my math skills, but what about a port? Is this as hard as it looks? Is there free (or cheap) software to help with this?