Asus Xonar Essence STU - Manual (Page 12)

12 ASUS Xonar Essence STU
6. USB port
Connect a PC via a Type B to Type A USB lead.
NOTE: You need to install the device driver that enables the Xonar Essence STU
to work with Windows operating system.
7. Power port (AC in)
Plug the supplied power adapter into the Xonar Essence STU once you have completed
all connections.