The reason I'm asking is that I have mid quality equipment(Pioneer)that I've been using for about 9 years now. I don't go easy on it either,it is played daily LOUD. My amp beats the hell out of my subs, but it sounds as good as it did when it was new. I can maybe see the crossover still working, but even the head unit was good until I replaced it with a new one that had Bluetooth and mp3 functions. Anyone else had good luck with car audio ? Thanks.