This is an 18" sealed, 2400 watt (RMS) powered sub. I bought it new 2.5 years ago from JTR. $1600 shipped to the lower 48 takes it.
Full specs:
http://jtrspeakers.com/home-audio/captivator-s1/
Full specs:
http://jtrspeakers.com/home-audio/captivator-s1/