I currently have Energy C3 bookshelf speakers with a low-tuned ported 6.5" subwoofer I built with this plate amp. I've been super-pleased with the tiny subwoofer and it was a great apartment setup, but I have it in a bigger room now and the midbass energy is not there in the kick drums (not that it really ever was, but in a small apartment room...)
From my car audio days I already have a nice 1.1-1.2 cu ft sealed MDF subwoofer box made out of 2 layers of 1/2" MDF. What would be a good cheap <$100 driver to put in it? What about amps? I was thinking about one of these $50 drivers or this $30 driver and this amp, but I know that matching a driver to a box is complicated. I only care about music quality and I mostly listen to stuff like Steely Dan and Dire Straits with some Isis thrown in.
I know that buying bigger speakers is probably the proper thing to do for my larger room, but I think maybe a sealed 10" sub might get me some low end back. Maybe I should build two 10" sealed speakers, put them under my C-3s, and cross them over higher than pure subwoofers?