I have noticed and others I've read have been complaining about the poor quality of the sound system with this high end unit. We purchased a new '08 Limited Mkx and the sound system isn't up to par. You have to turn the bass as high as possible to even notice it's there. The dealer acknowledged that Lincoln knows there is a problem but they don't have an answer at this time. I've heard that the DVD units have a different amp and you don't have this problem. I not looking for a thumper but I would like to get what I thought I was paying for. Anyone having this problem or heard of this? Other than that the MKX has been flawless and wonderful to drive.