Summary: I own a pair of these in ported box. I have them wired down to 1 ohm and Im pushing them with a Hifonics brutus 1200.1 amp. I am actually very impressed with how loud these can get when they are pushed. They will get low a loud. I was also impressed by the sound quality at normal listening volume. I was a little disappointed in the sound quality at higher levels. If your not concerned with SQL then these are a decent mid grade sub.
Summary: I've had the rockfords p2/p3s, i've had Audiobahn, Kenwoods, Sonys, Rockfords,Bose, JL- almost every mainstream companies thats on the market. You cannot beat this subwoofer price against quality/strength I have 2010 12'' totaling 1500 rms, and i'm using a 2010 zx2500.1 2814 rms against 1500, and it performs flawless! the 2010s are actualy better than the older one, i can prove it because i've gotten them both metered and, the 06's burnt sometimes but the 2010s NOTHING!