I just modeled a few enclosures for this subwoofer and found that this subwoofer produces the best low end response of all the popular woofers out there like shiva, mass, and stryke. Its sealed f3 is around 28hz and it has an f7 at 20 hz. In a room it probably has an f3 close to 20hz. Also with 350 rms watts it produces 115db (measured 1 meter away) from 30hz+ and about 108db at 20hz. Partsexpress also claims that this is one of their tightest and most musical subs. However these are are theoretical performance numbers and I am wondering how well this woofer actually performs in a optimal size sealed enclosure. Will it exceed the performance of any 500/1000/ or ? commercially available sub? Also if u put it into a ported enclosure its f3 will be around 16hz, but it will be twice the size of the sealed box.