Apple Macintosh Performa 6400 Series - Manual (Page 45)

Follow these general instructions when connecting audio equipment to
the Macintosh:
1 Make sure that the audio equipment has a cable with a stereo miniplug connector.
If it does not, attach an adapter that has a stereo miniplug.
2 Place the audio equipment near the Macintosh.
3 Shut down the Macintosh and turn off the audio equipment.
4 Attach the cable to the audio equipment and to the appropriate sound port on the
Macintosh.
To record incoming sound on the computer, connect the audio equipment to
the sound input port (≈).
To record the sound produced by the computer or play that sound through
external speakers, connect the audio equipment to the sound output port (-).
5 Turn on the computer and the audio equipment.
You’re now ready to begin listening to and working with sound.
You can adjust the volume using the sound control buttons on the front of the
computer or by using the Monitors & Sound control panel, which uses
software inside your computer to adjust sound. See “Adjusting Volume and
Sound” in the previous section, “Using Your Computer’s Sound Features.”
Stereo miniplug
45 Connecting Equipment and Expanding Your Computer