Macbook Pro (2011) speaker balance keeps resetting to the left

I recently notice that whenever I reboot/startup my macbook pro, the speaker balance keeps defaulting halfway to the left. I never notice it much except when I'm listening to songs that have some part only playing in one side. I just find it odd that during startup it defaults to be halfway to the left, and I'm wondering if there's a setting somewhere that I missed that can make it the default preference.

Are you using an external display?
Along with others, I have the same issue on a MBP 2011 when using the 27" Cinema Display:
https://discussions.apple.com/message/20360772#20360772

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Okay, I'll add my frustration here as well.
I've had this problem too, and more noticable since the 1.4 update.
I posted a thread similar to this here.
But I'll just copy over what my main problem was...
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It seems that the problem is more prominent when I have my computer with everything on it as usual. As in, before I took it to the Apple Store I performed a clean install of OS X, and that may be related to how bad the problem is, any opinions?
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Ok....I just found this here:
http://support.apple.com/kb/TS3336
Quote:
+"You may notice that when you move the Balance slider in the Sound preferences pane far to the left speaker that you can still hear sound from the right side of the MacBook Pro.+
+This sound is actually generated by the sub-woofer, but because of its placement, the audio from the subwoofer seems to be coming from the right side speaker. Due to the placement+
+of the subwoofer it is normal for the sound stage to seem shifted slightly towards the right speaker. If you prefer, you can adjust the balance control to shift the sound stage to the left or right side."+
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Macbook Pro (2011) speaker balance keeps resetting to the left

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