Apple Macintosh Performa 6360 Series - Manual (Page 47)

Connecting headphones
You connect headphones to the headphone jack (f) on the front of the
computer or to your monitor if it has a headphone jack.
Note: 3D Surround Sound may not work well through headphones.
To disable 3D Surround Sound, open the Monitors & Sound control panel in
the Control Panels folder in the Apple (K) menu; then click the checkbox to
remove the checkmark next to “Enabled.”
For more information about listening with headphones, see the “Sound” topic
of Macintosh Guide, available in the Guide (h) menu.
Headphone jack
f
47 Expanding Your Computer and Using Its Special Features
You may need to disable
3D Surround Sound
when listening through
headphones.