Got my new MBP 2011 15" base model the other day. Love it so far except the sound is not quite right. All songs from I-Tunes sound like they are favoring the right speaker. I went into the preferences and saw the balance set to the middle. When I play with the balance slider and go all the way to the right the sound just comes out of one speaker but when I slide it to the left the sound still comes out of both speakers. Does the same with Pandora. Should I just take it back and get it replaced or is there a driver I can try to re-install?