As you know I have been looking into doing a DIY subwoofer project instead of just buying an already built sub. I will be able to get more bang for your buck and I heard DIY projects are kind of fun. Well, I'm almost ready to start, I have decided to go with Adire Audio since I have heard so many good things about them. Heck I even hear their subs sound good in a car as well as a home. Well, here is the main question, I also have a few sub questions but this is the main one. Their are so many different box designs out there I don't know which one to try. I was wondering if someone could tell me the rank of theses different box designs in SPL, SQ, and difficulty of building. Also I was wondering if you could tell me the pros and cons of each box.
Here is the list: sealed, ported, passive radiator, 4th order bandpass, 6th order bandpass, or vented (never seen this in a home only in mobile audio).

Note if I go passive radiator I will use Adire Audio's PR-15. The first three are the main ones I'm thinking of about trying, however I'm not to sure how the last three sound so that is why I asked, however I still might go with any of these designs.

Thanks for the help on that question now here are the sub questions. If you don't feel like answering these then don't bother it is up to you. However I would really like it if you could answer the main question above and the sub questions.

Well, really I don't know whether to go with the Shiva, Tempest, Maelstrom, or Brahma subwoofers form Adire Audio. Also if you decide which one of these subs you like then I was wondering if you would also suggest an amp from Adire Audio that you think would match the subwoofer you have selected. And if I go passive radiator like I said I will use the PR-15, to tell you the truth I don't really know if any passive radiator is different from another.

Also do you think I could use any of these Adire Audio kits they sell on their website?

Here is the website address: http://www.adireaudio.com

Thanks for reading and for the help,

Chris