there is the Armageddon z series, u-2, u-3, and another one too, but it is around 500 rms, where the z series is around 1000+ rms, and the u-2/3's take around 2000 or more. One way that i know i can tell the Armageddons apart is by the logo on there dust cap.With the z series, some say Armageddon, one model is in red colored lettering, another has black lettering and the other model i have seen just say kove audio on the dust cap with the word kove way larger in red. I picked one up for my brother and it was definitely a good choice. It hits pretty loud and keeps up with fast kicks. It plays the highs really well and still can bellow the lows when it wants. I have it in 4 cubes tuned to 28hz and i cant complain about anything. I have not however tried it sealed, but i think i might build a sealed box for it to see what i can do in that type of enclosure.