Setup guide

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Chapter 4-
Configuring System Settings
4. Click on the Internal Microphone selection (if available) and set the input
volume slider bar to the minimal level.
5. Click on the Line In selection in the Choose a device for sound input
box to select that as the default input for sound (if available). This will
effectively disable the internal microphone (Figure 11).
Figure 11: Sound Panel Line In Setting
6. Set the Input volume slider bar for the Line In selection (if available) to the
minimal level.
7. Use a dummy plug (a plug with no wires, not connected to any other devices)
to plug the Line In jack on the machine.
If there is no Line In jack, then the only setting available under the Choose a
device for sound input box will be the internal microphone (if there is one), and
there will be no way to remove that option. In a system with an internal microphone
and no Line In jack, the internal microphone will be selected by default. If this is the
case, the slider bar for the internal microphone input volume should be set to the
lowest possible level (Figure 11).
In either case, it is recommended that the internal microphone be physically
disabled. As explained in the section on Bluetooth above, disabling or modifying the
hardware will likely void the warranty on the machine if not performed by an Apple
Certified Technician. For information on becoming an Apple Certified Technician,