I just purchased awesome 12" powered stereo subs not three months ago & are selling them, its all the SI's fault. hell yeah OB is faster. i had no clue what that meant (never heard such a thing either) before these beasts entered my L/R.
anyways, boxed subs aren't going to work for us i don't think, unless they are crazy expensive. by this i mean for a lot of $ ultra fast boxed subs exist, so i'm told..
i'm looking at the H baffles or Hawthorne Augggies. good thread here going on about H baffles (OB subs)
open to new ideas though for sure.