[NAME] hi, this is the set up guide for your XPS 8300.  You can follow the instruction on page 26 and 27 to connect your surround speakers.
Hi, I bought xps8300 desktop and Logitech z506 5.1 surround sound speakers form Dell 9 or 10 years ago. The desktop has a THX TruStudio PC mark as well. Can anyone tell if XPS 8300 desktop came with a separate sound card or integrated sound card?  What is the make and manufacturer and how can I find it physically in the desktop? I never noticed in 10 years that rear left (blue connector) and front left (black connector) speakers are not there.  I just realized it now.  I guess they were not in the box originally  The sound does work, but it comes only from the one speaker that has a power button and volume control as well. What do I need to do to use the surround sound speakers?
Dell XPS8300 sound card to use surround sound speakers