If the computers audio isn't coming out from the room speakers, follow the instructions below to configure it.
You will see a green audio level on the right side of the window corresponding with the selected output. If the system audio is being fed to the 'PC Speakers / Headphones' output, you will hear audio from the room sound system. There should be a green check next to the Speaker/Headphone icon to show they are set as default. If no audio is heard, continue to the next step.