MSI 655 Max User Manual page 88

When you choose 6CH, the audio output will function as the screen showed
below.
Check the Speaker Test tab in the right side. It shows the speaker figure and
test environment complying with your speaker type settings as follows. You
can click Auto Test button or just click each speaker for testing your audio
connection. The sound will repeat unless you click Stop.
Using 2-, 4- or 6-Channel Audio Function
A-7