There's an internet wholesaler that sells that FF12 for $350 with a 15% coupon if you ask for it. Ended up getting mine for $315, and I think it sounds pretty good. It rolls off heavily below 25hz, so don't expect much it to play loud at 20hz. If I had to do it all over again, I'd go for the next class of subwoofer in the $500-600 range.
Wish I could give some measurements, but I don't have the equipment to do so.