So it has been over 2 years since I started this thread, and I still don't have a subwoofer!
In my defense I was in the process of moving.
I was wondering if any of the recommendations have changed in the last few years. I'm still using a home theater system with five Athena bookshelf speakers.
1) I do not want to add muddy or boomy bass because I love the clean accuracy of just using bookshelf speakers for music. So I want clean accurate bass from any subwoofer.
2) My use is split probably 60/40 between music and movies/gaming. Although I still prefer accurate bass over room shaking bass. I've been using bookshelf speakers for the last five years, so any subwoofer will probably be an improvement in adding low end.
3) My room is approximately 350 sq feet (living room and dining room) with 8.5 foot ceilings. So that comes out to just shy of 3,000 cubic feet. The kitchen also attaches to this through a small doorway and is not included in this calculation.
4) Budget as under $600. The lower the better, $600 is the highest end and will take me a bit longer to save up for.
With these requirements I was looking at (in order): Rhythmik L12, the Rhythmik LV12R, SVS SB1000, Outlaw M8, HSU VTF2 (MK4/5).