How to use stereo speakers instead of computer speakers
Before connecting the stereo speakers to the computer, you must verify you are using the same size RCA jack for your computer and your speakers. The stereo plug is usually larger than the computers jack. If this is the case, visit a local retailer, such as Radio Shack, and purchase a conversion plug. When purchasing this conversion, ensure you buy a stereo plug and not mono. You may need a cable that is long enough to go from your PC to your stereo.
After purchasing the adapter or confirming the speaker connector, connect one end of your cable into the line out port. Connect the opposite end of this connector to the stereo line out jack. Before attempting to use the stereo system, ensure that the sound volume is low before playing any audio.