i finally sold my old 2.1 system for $25 so now its time for a good subwofer. i saw that dayton had some cheap subs and i was a little skeptical but after a few youtube videos, i think they are pretty good for $15. so do you guys think that would be a good investment? this is the sub http://www.parts-express.com/pe/showdetl.cfm?Partnumber=295-480