I previously ran this subwoofer in a prefab box with about 950rms going to it. It sounded ok and was able to hit 141.2 on the termlab, with no previous expierance with car audio ( this was my first system). I liked it at the time, but now have upgraded and much happier. After hearing a couple of differant systems, relized that this subwoofer just sounds ok, but it does get loud.