Conclusion: These subs are very nice, and have a clean bass response. For the price, I was not expecting the quality and capability of the subs. I'm running two in parallel @ 2 ohms with a 500 watt RMS Kenwood amp and they are simply outrageous!
Conclusion: It took a while to get it set to the levels I wanted but that was due to my amp. I absolutely love the tight and powerful bass this thing produces. I find myself listening to more bass-intensive music than I used to just to hear this thing hit.
Summary: Nothing bad to say about this speaker. I should have bought two if one sounded so good, but space constraints. Have it in a Sound Ordnance .95cu sealed enclosure with 200w RMS and it hits great.
Summary: Great subwoofers. I purchased two of these with the JVC KS-AX3201D amp and a Sound Ordinance ported box and they pound! Very impressed. I listen to a lot of different music and not only do they sound good with rap/hip-hop, they sound great with rock too.
Pros: Hits hard, looks cool, and the price isn't bad.