Asus BE27ACSBK Series User Manual page 27

If the USB cable and the HDMI or DP cable are connected from monitor to the
computer,
Click ASUS BE/C6 webcam series Set Default, the monitor speaker will be used
as the default setting.
Click OK to exit the Sound setting.
Sound setting set the BE/C6 webcam series as default.
ASUS BE27ACSBK Series LCD Monitor 2-11