■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.
Center
Front Left
Side Left
Rear Left 
Front Right
Side Right
Subwoofer
Rear Right