Have a box for a different sub i'm running right now, wanted to know if i could expect good low end bass from a 12 d2 in a 2.1 cube box tuned at 30 hz before driver displacement.. I would be feeding it ~700w daily. I'm a deep bass junkie, but i had to get rid of my HC 15, and need something in a 12" driver that can get LOW in a box no bigger than 2.1 cubes ported, 2.3 cubes sealed and shallow (12" would be my only option from SI). I can get more power, i was wondering if i could just plug the D2 into my box as i don't really want to make another one, it's quite a pain because it's not square. I suppose i could take the backseat out of my Wrangler again, but that won't happen till wintertime, and if i could avoid it permanently and be happy with what is back there, then i will just keep it behind my rear seat. Thanks for any input --Greg