Summary: I bought this last year from Amazon because I wanted to add a low cost subwoofer to my factory stereo - Equinox. I can happily report that even at low wattage levels it produces clean base and sounds great.
Summary: I compared a couple of brands of boxed subs at the stores, and the Pyle, though cheapest, sounded then best. I have one in each car. They give a nice solid punch. Not enough for the sonic boomers, but my 8" pyle box coupled with 2 infinity kappa 6x9's in back (components up front) and an infinity 6-channel amp has put many average just plain loud and sloppy installations to shame! Not just loud, but clean and loud. The Quoobz are a good secret choice.
Summary: The first thing I noticed while unboxing the subwoofer is the weight of the carpet covered, cast-aluminum box, very nice heft but the carpet is slippery. Plexi-glass window on one end let's you see the travel of the heavy duty blue, poly cone. Dual ports on the opposite end of the box have a very smooth finish. Actual power ratings are 350 Watts RMS/500 Watts peak.