Dell S520 Projector - Manual (Page 86)

86 Using Your Projector
Using the Audio Projection
10 You are now logged into the Dell Projector Connection Manager.
Click the "Play" button in the application to starting the LAN or
wireless audio projection.
11 Click the "Audio Projection" button in the application to enable audio
projection function
NOTE: Audio projection function needs installation of extra driver
only in Windows XP. If your computer does not have the driver
installed, a pop-up message will appear on-screen prompting you to
install the required driver. You can download the "Audio Projection
Driver" from the Dell Support site at
dell.com/support.