Just picked up an Obcon dual ported box from a friend, an Jeson 900W amp, and a Type E sub.
All for 150. Just the box is worth that http://www.obcon.com/contents/en-us/d14_01.html
And going from my JL 12 sealed, to a Type E 12 ported in this monster.. Its amazing. Sounds mean.
Smaller sub is my JL W1, and the bigger is the Alpine Type E. Then there are the two different box's.
This is how it looks now.. Pulled out just for the picture.. LMAO it really does it
Just another size difference
I tried the JL in it, but the Alpine gets louder
Check out my youtube account for videos of new and old sub setups