I own the JBL sound package; however I'm unable to read FLAC files over USB (mp3 files work though). My question is whether the ability to read FLAC files may also require having purchased the navigation system, which I didn't. Thanks for your help.
I too opted for the upgraded music system which plays FLAC files without any problems. Mine also came with sat Nav but not sure if that makes any difference. I just use 8gb Sandisk usb sticks with the albums in folders and it finds them all perfectly.