Ugh, day one of my new XE Sport. Love it, but sound quality is surprisingly poor for an upmarket car. No base and very tinny. Off to the local specialist car audio as soon as possible. Actually had this on a previous car, and can confirm that it is the head unit itself that is the issue. They can upgrade speakers, put in a separate power amp (usually in the trunk), and add a sub speaker (heavy base), but the quality of the sound itself is generated by the head unit. With the way they are integrated in modern cars, you can't change that without losing all the other functionality. I will post further on what gets done and the outcome.