Apple Power Macintosh 7500 Series - Manual (Page 55)

4 Attach the cable to the audio equipment and to the appropriate sound port on the
Macintosh.
To hear or record incoming sound on the computer using a cable with a stereo
miniplug, connect the audio equipment to the sound input port (X). If you’re
using a cable with two RCA-type connectors, connect the audio equipment to
the right and left audio input ports (-).
To record the sound produced by the computer or play that sound through
external speakers using a cable with a stereo miniplug, connect the audio
equipment to the sound output port (-). If you’re using a cable with two
RCA-type connectors, connect the audio equipment to the right and left audio
output ports (-).
5 Turn on the computer and the audio equipment.
You’re now ready to begin listening to and working with sound. For more
information on working with sound, see the “Sound” topic of Macintosh
Guide, available in the Guide (h) menu.
Connecting and positioning a microphone
With appropriate software, you can use the Apple PlainTalk Microphone that
comes with some Macintosh computers (or a compatible line-level
microphone) to give spoken commands to your Macintosh and to record your
voice or other sounds.
Do not use the round omnidirectional microphone supplied with some other
Macintosh models.
Apple PlainTalk Microphone
45 Connecting Additional Equipment