I have been working with car audio professionally for several years, and was excited to see the release of such a space-saving product with a decent power rating. Aware that this subwoofer wouldn't sound like the Earth rattling system I had as a teenager, I bought it simply to add another chunk of thump to my Jeep's factory sound system. Reading some good reviews, I thought "Great! Now I can add some bass and keep all of my cargo space free!" When I read some of the poorly rated reviews, I figured "Eh.. it's probably some young kid who was expecting the thing to sound like two 12" DVC subs." So I thought about my needs, and went for it. After the relatively easy installation, everything looked beautiful... and then I turned it on. The bad reviews suddenly popped into my head. WOW - What an extremely misleading, innefective, poor design. As one previous posting mentioned, nice sounding low frequencies at low levels, but when you give it even a slight amount of decent volume, the entire unit would crap out, distorting or weakening in power, and creating an obnoxious rattle from the unit itself. I tried to tune it and work with it several ways, but found myself on the phone calling for a return authorization 30 minutes later. As I mentioned, I speak as someone who is capable of producing a knowledgable car audio review, and if the scale goes 1 (poor) to 5 (best,) I give it a flat 0. I suggest viewing any other options before purchasing this powered sub.