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Hi Donald, It gives you the option to use 2 subwoofers. 5.1 is one of its functions for a single subwoofer setup. You may refer to page 16 of this link: https://www.sony.com/electronics/support/res/manuals/4726/55cd375e0f9e7103f2b6baa747ed9072/47269061M.pdf ~Ralph
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