Quote Originally Posted by minye
"For $600 you could easily build a crazy ass subwoofer that you couldn't buy in a store for over $2000."

That is really persuading.

Kex,

Can you give us some examples among commercial subs that have about-equal performance as the $534 12" and $688 15" Titanic?

15" Titanic seems to be so good that I can stick with for a long time...
There are many designs out there that offer better this or better that....depends what you're looking for. The Titanics aren't bad or obsolete by any means, they're just designed to offer wide appeal rather than tailor made to certain preferences.
The most popular from the Parts Express/Dayton crowd these days is the new Reference line of subs - here's a good project that will offer significantly better sound and most of the output and extension of the Titanics in a smaller box. These are all the rage in Dayton world right now - and again arguably the best value in performance subs (Dayton's big on value).
http://www.partsexpress.com/projects...ake/index.html

There are better woofers and designs out there than this though, depends what you want and what your budget is:
Just google Adire, TCSound, Dayton, Ascendant Audio, Brahma, and you'll find plenty of projects soon enough.