8 TB Subwoofer #W8-740C

It has a massive magnet!

http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=264-854

Port added bass... but in my room the difference is small.

According to Parts Express this driver works best in a .65 cubic foot cabinet with a port of either 3" diameter x 27-1/3" length! or 2" diameter x 16-1/3" length! That's a lot of tube! Shorter lengths produce too much audible port noise.

This tunes the box to 34Hz.

Sealed = 78Hz