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The first number is the number of regular speakers, the second number implies that it has a separate sub-woofer. If you're purely interested in voice, any should be adequate. The extra speakers give you a fuller, more expansive sound experience, making it more realistic, and closer to a movie theater experience.
Sorry, there was a problem. Please try again later.2.1 has two-channel output, plus a subwoofer. 3.1 is a 4-channel sound system and one subwoofer. Speakers are positioned L-C-R (left, center, and right) and the sub should be on the ground level in the center. Center channel is usually used for dialogue, while the L and R channels are used for ambience, music, effect, and all other stereo sounds. 4.1 has 4 channel output and one subwoofer. As for the sound this depends on your preferences and how much immersion you are wanting to have. If you are in need of any assistance, have additional questions, or would just like to see our helpful tips, check us out on Twitter @LGUSSupport Facebook https://www.facebook.com/LGUSA/ or you can give us a call at 800-243-0000. ^CP
Sorry, there was a problem. Please try again later.Here's a good explanation - https://thehometheaterdiy.com/surround-sound-channels-explained/
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