** Posting for a friend, but I have the sub in my possession at the moment. Would prefer local sale due to the size and weight of this unit. I can also work with you on delivery and setup if you are located somewhere in the local bay area. It is a great sub for the price. It is a 12" with 12" passive radiator, 350w, and a F3 of 20.8Hz in this box config. It is very solid and has impressive output. In my room, it comes close to my 15" in output from about 20Hz and up.
Driver Specs:
http://www.gr-research.com/drivers/sub_pr.shtm
$350 OBO.