Actually Image Dynamics is not closed. The guy who founded the company decided to leave because of problems with co-owners, and it does not change the fact that they make good products. I can't go ported because I don't want to sacrifice the space in my trunk. I'm not after shattering windows with dbs, I just want some lows. Thanks for the input! I'm defiantly getting the BP option and I'm gonna lower the gains on my amp accordingly. I'm thinking the 0.749 cu ft box would be too small because after displacement of the sub it would only be 0.669 cu ft and that is smaller volume than your 10" X. Anyone else has any other opinions on which box I should get for 12" Fi X?