I have the Audi Sound System fitted in my Pre-FL S3 and once configured there is tons of bass & volume???....sound has to be configured for every selection though.....Radio/Media/SDCard etc......one configuration doesn't do all...if that makes sense ....but I'm well chuffed
My grandparents have this system, I can't find fault with it either. Mine seems to be awful, just really disappointed with it.. I were excited when I saw that sub in the boot too.