In addition to its internal microphone, your PowerBook has a stereo sound
input port (marked with this icon: X) to which you can connect an external
sound input device that provides line-level output.
You cannot use both the internal microphone and an external sound input
device at the same time. You can select a sound device in the Sound control
panel (see the Macintosh Reference book).
Sound output devices
The PowerBook also has a stereo sound output port (marked with the icon -)
to which you can connect speakers, an amplifier, headphones, or other audio
output devices. The sound output port accepts a standard stereo miniplug,
like that used to attach headphones to a portable tape player.
WARNING
Do not plug a sound output device (such as a pair of
headphones) into the sound input port. Doing so may damage your
audio equipment.
109
Connecting Other Devices
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