Sounds like there's an ACI in your future.[] Well, maybe.

I have a Titan wich is rated down to 20hz. While it may get there, I'm not sure how many db's at that point . . . never measured it.

More importantly though, I think this sub sounds awesome! When playing music the Titan simply sounds like an extension of my CBMs. It handles HT very nicely as well. Yep, it'll shake the walls when necessary.

I doubt, however, there's very much info below 20hz. Moot point for me; this baby's more than adequate for my 14x20 room.

There may be other options, including DIY (maybe not), but I'm not familiar with other commercial offerings (sealed).

You didn't mention your budget. The Titan isn't cheap, around $1300. You might also consider a dual Force set-up, about $1500-1600. Hey, if you have $2000 or so, there's the 15" Maestro with some very nice electronics to go with it.

www.audioc.com

Have fun with your search.

Cliff