MSI P43 - Manual (Page 77)

A-15
Realtek ALC888 Audio
Test Speakers
You can select the speaker by clicking it to test its functionality. The one you select
will light up and make testing sound. If any speaker fails to make sound, then check
whether the cable is inserted firmly to the connector or replace the bad speakers
with good ones. Or you may click the auto test button to test the sounds of
each speaker automatically.
Subwoof er
Front Right
Rear Right
Center
Front Left
Rear Left
Side Left
Side Right