D'oh! I forgot.
This is for your computer setup, right? If you locate the SB12-NSD nearfield, within 3 feet or so of where you are sitting, you'll get the full bass effect out of it while sitting at your computer. It just won't fill a room that large very well. There's often discussion on the AVS subwoofer forum about nearfield usage in large rooms if you want to learn more (or ask a question).
I'd say definitely go for if that's the primary listening use.