Welp, I've decided to build my sub. I used to be a car audio nut and so I've built 5 or 6 sub enclosures before. It sure was easy to get killer bass in a car. So now I'm about to build a sub to compliment my Def Tech BP8B mains / C1000B center / BP1X surrounds. I want to keep the budget under $500 including amp, driver, box and materials (I have most tools). I'd say it will be about 70/30 for movies/music use. I don't listen to pipe organs or "1812 Overtures", but I have a broad taste in music so acceptable output to 20Hz would be nice. This will be used in a (26'x15'x8'total) living room that's open to the kitchen on one side. So about 3000ft^3. I listen to most of my movies at about -10db. Now to get to the point... My concern is box size, and I'm almost positive I don't want to do a sonotube. I just don't think I can finish it as well as a box (especially with a plate amp). Of course I want the box as small as possible; I'm thinking 3.5-4ft^3 max. I was just about ready to do the Shiva when I thought I would be able to get more output in the frequencies that mattered most to me (low 20's on up) with the Tempest in about the same size box. I've been using "Tempest Apps Vented Adire Alignment.box" from TempestDesigns.zip on Adire's web site for my basis. Change the box to 115L and tune to 20Hz. Then switch between the Tempest and the Shiva. What are your thoughts on this? Now, to add another sub to the mix this thread got me thinking about the audiobahn ALUM12. It's the right price ($119) and it looks to have suprisingly similar T/S params to the Shiva. Take a look at them here . Has anyone used this driver? If the specs are right it looks like I would get much better performance than the Shiva in a smaller box. Any and all of your suggestions are greatly appreciated.