|You have to have a 5.1 source for it to output 5.1 audio. MP3s and most movies are not 5.1. You might have to play a DVD movie with 5.1 audio to get your 5.1 audio out.|
A 5.1 sound card has a decoder that decodes the 5.1 audio and sends the correct (front left, front right, rear left and right, woofer) audio to the correct speaker.
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