Has anyone had experience with subwoofers from Adire? They have two models; one is less expensive ($399) and the other is more expensive ($599).

If you are speaking of the Rava and Rava SE, I have read many postitive things about them, but have no personal experience with them. At $599, better known SVS and HSU might be considered. Might be worth the effort to do a search on Adire and Rava in the Speakers forum at AVS Forum.

for diy subs. There is a new product http://www.ascendantaudio.com/Products.htm that uses adire's XBL^2 technology. More Xmax than Adire Shiva and tempest and the price isn't that much more expensive. There are some talks over

http://www.htguide.com/forum/showthread.php4?t=9361

and

http://www.hometheaterforum.com/htforum/showthread.php?s=&threadid=220302

The tumult subwoofer is also an excellent choice. If you have time to build a cabinet and do some homework. This puppy will deliver the goods
http://www.adireaudio.com

The discussion in the two threads I mentioned seems to point out that the Avalanche 15 and 18 Subwoofer might have a better price/performance over tumult.

they make very nice car audio subs.