I have made many sealed boxes and (except for my first one) they have all turned out great. Sealed boxes won't win me any contests so i need to learn how to build ported boxes. I have made a few blueprints for 2 old systems of mine but they were to the exact specifications in the manuals for the subs. And this is where I become confused. Here are some questions that I have:

1. If the port length, width, height is stated in the manual do I have to use them in order to get the full potential out of the subs??
2. If not what are the things you have to look at when building a ported box.
3. How
subwoofer???
2. What happens if I would make a box for two subs in the same air space? Would I have to double the height, width, legth of the port? Or triple them if I have 3 subs?? Or how on earth is that done???

Holy crap i am so lost that I don't even know what questions to ask. I have so many questions but I don't know how to ask them. If you guys have any suggestions to where I can learn a lot about this stuff please tell me. I would just ask for a design and then build it but that is kind of like cheating and I want to be able to say, "ya, it is all my handy work" when my friends asked who did it .



EDIT: And could you guys let me know about a good program used to calculate what a box is tuned to??? Thanks