looking for advice on budget subwoofer


I have a budget system (rotel ra-932 integrated amp, B&W DM601 speakers, jealous?) and am looking to improve it a bit.

If anyone has advice on a budget subwoofer, or other ways to spend $300 or so to improve the system, I'd be curious to hear.

I just use the system to listen to music (no movies) mostly rock and jazz.

It is in a 12 x 12 room.

many thanks!
davidvan
Yes...a sub will improve the sound by providing a foundation to the music. If you cross over appropriately, and the sub has a built in amp, you will free your amp to drive only the mids and highs which will greatly improve with the subs addition. The quality of the sub is not that important - any powered sub will do the job.
http://www.audiogon.com/cgi-bin/cls.pl?homesubw&1319484164&/Yamaha-soavo-900sw-birch-new-a
I have a budget system I use in the winter, and I was able to get a Mirage subwoofer on sale for under $300, that is very musical. Vanns has the following subs marked down that are in your range:

Yamaha Soavo: $400 (retail was $1,400) - This would be my choice - 18hz!
Mirage MM8: $350 (retail was $800)
Velodyne SubContractor Series 12: $400 (retail was $800)
REL T3: $400 (retail was $600)

Hope this helps,
mot