I think the best you can hope for with FCA/your dealer and the sound system is some type of credit. You ordered premium, and you didn't get it. I agree with Crafty, the lemon law isn't going to apply if the stereo is the only problem. I would push hard for a credit from whatever the "premium audio" costs, then go a place that knows car audio and get a real system installed. However, I am not convinced that this is anything more than a software problem. As I said earlier, either there is software telling the amp what freq to crossover at, or there are filters. Either way, they should be correctable!