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Connecting Headphones
You can connect headphones to the headphone jack on the front of the
computer or to your monitor if it has a headphone jack.
You may also want to disable 3D Surround Sound in the Monitors &
Sound control panel if you are listening through headphones. Some-
times, 3D Surround Sound distorts the sound through headphones. To
disable 3D Surround Sound, open the Monitors & Sound control panel
in the Control Panels folder in the Apple menu and click the checkbox
to remove the checkmark next to “Enabled.”
Audio Out