Despite all of my concerns about theft, I have installed the Alpine CDA-7894 that my Dad gave me for my birthday almost two weeks ago. (I suppose the fact that my car is in a secured parking lot during the day, a guarded-by-off-duty-Columbus police at school and garaged at night has something to do with it.) And wow, what a difference. I'd already replaced the rear deck speakers with a set of Pioneers and added some sound deadening to the rear deck. Now, the 80-watt, 6 1/2" sub itself is rattling.