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A possible fix for an apparently-broken left speaker Laptop Macs
If you notice that the left speaker on your MacBook Pro or MacBook has gone silent, make sure to check the following settings before making an appointment with the Apple Store for a hardware inspection:
  • System Preferences » Sound » Input: If 'Use Ambient Noise Reduction' is checked, simply uncheck it to unmute the left speaker.
  • Applications » Utilities » Audio MIDI Setup: Go to Audio Devices, and select 'Built-in Output' from the Properties For drop-down dialog. Now look under Audio Output and make sure Channel 1 isn't lowered or muted. Note that this program doesn't report the 'Ambient Noise Reduction' setting as Channel 1 being muted. (Some users have reported that iChat AV may lower the left speaker's volume drastically for voice conferences, so you may need to repeat this step after each use of iChat AV.)
The couple of minutes it takes to perform this basic checkup is certainly worth saving a trip to the Apple Store.
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A possible fix for an apparently-broken left speaker
Authored by: HailAlistair on Sep 26, '13 07:29:38AM

Thank you! I was despairing that I had broken my speaker while replacing the thermal paste of my MacBook Pro Early 2011. My left speaker was making noise, the unchecking "Use Ambient noise reduction" fixed it completely!

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