I just discovered an issue with the internal speakers of my Macbook Pro 2011. The balance of the left and right speaker is off. When I move the balance slider all the way to the right only the right speaker is active (as it should be). When I move the balance slider all the way to the left, the left speaker is active, BUT also the right (not as loud as the left though). Do you have the same problem? I'm pretty fussy when it comes to stuff like that....so I'm thinking about returning it.