Texas Instruments Extensa 600 Series - Manual (Page 79)

Audio Options
4-9
Your system comes with a set of built-in stereo
speakers, but if you wish to use other stereo
equipment and/or use a microphone, the system
comes with three audio jacks — Line Out, Line In
and Microphone In.
Connecting Audio Devices
Line Out allows you to use external speakers or
headset. The system’s internal speakers are
disabled when external speakers or headsets are
plugged in.
Line In allows you to input an external stereo
source into your computer. This allows you to
play an external CD through the system
speakers, for example, or make a recording if
you have the correct software.