All of us are pretty sure that the super cars come with full throttled engines along with best speakers to make your driving experience good. People ask things a lot, they are never satisfied with what they have. A Friend of mine owns an Audi A4, guy drives it day and night, but he keeps asking me if there are any good options for speakers even though Audi comes with the best JBL system.
See guys, car which are priced at this huge price point don't require changes as such. The system that company integrates is the best fit for the car, and should be kept intact rather than changing anything in there. Even though this speakers website covers everything regarding subwoofers and speakers, you don't really have to change anything.
Check out Audi A4 2015 Review.