Let's see--I've had the STF-2, the PB-10 and currently have the PB-12. All 3 are excellent subs. I can't say 1 is better than the other 2, only that the PB-12 gets louder and deeper obviously. Do I need the extra 2" in my 1152 SF room, probably not, but I love the PB-12. I can "feel" the 12 more than the other 2 and that was the primary reason for getting it. My next one will be a 500!!!! Hurry up tax return...