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The 3 audio connectors on the back of the computer are usually - Headphones/Line Out, Microphone, and Line In. To get audio sound FROM the PC only the Line Out is used. This socket provides STEREO SOUND ONLY but can be connect to a 5.1 system using a 3.5mm stereo connector to stereo RCA cable (the RCA cable with red and white ends). These are then plugged into the red and white RCA sockets on the 5.1 system but will only give stereo sound not true 5.1. 5.1 is not available unless you have either an optical connector or a coaxial digital connector on the computer. BTW the 3 audio connectors on the back of the computer IS a sound card, it is built in to the motherboard.

buy this kind of wirelook for a wire with the output end that is the usual one you use for plugging in the normal PC speakers, and the output end like the red and white ends that you connect to the sterio. buy it, and plug it in the right places, and that's it. you got ur PC connected to the sterio system. i have that too, and it works, but it wont give u true 5.1 sound although the quality of the sound is a great deal better! Check your BIOSSome of the built-in soundcards on modern motherboards do support 6-channel sound (5.1). By default those 3 ports may be Headphones, line out and mic, but if you go into the integrated peripherals section in your BIOS menu there may be an option to enable 6-channel sound. Doing so will reconfigure those ports to 3 line outs, front, rear, and sub.

This is not the case with all motherboards and it is very likely that your best option may be to install a PCI sound card, they are very inexpensive.

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Q: How do you connect a 5.1 sound system to the 3 audio connections on the back of a computer so without using a sound card?
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