Ready to pull the trigger for a 12" sub, will need to go into a small sealed box, preferably 1.25 cu ft or smaller. Going into a 2014 328i, everything else will remain stock. Putting my SQ Q-1200D into it to push the sub. My first choice, and because I've been dying to try these subs, is Tantric MD. I know Gcon is also a good sub. Would anyone prefer one over the other or would anything else in the similar price/power range that would sound good in a small sealed box? Thanks.