So I had the car in the garage today and thought i'd do another stereo analysis. Ha. I was actually pretty impressed today with the bass. I went inside, and the woofers, mids, or whatever they are were rattling some of the house. The only thing I noticed was that the bassy beats on some of the songs would rattle something inside the rear bumper. Has anyone else experienced this? I laid on the floor and tried to feal up under there to see if I might be able to fix it, but I could come up with nothing. The only way I can really describe the sound is as like a "flutter." Sounds kind of like somone holding a piece of paper up against a subwoofer. Kind of annoying and sounds like one of those cheap cars with a modded stereo that rattles the whole car. Thanks for the input in advance!