Clueless on what to use

I just bought an Onkyo SR-308 and a RM6750 system. I am confused on how to hook-up the sub. The Onkyo has a single subwoofer port going out. The Subwoofer has a "Line In" "L" or "R". Is there a cable to convert the single line out to a dual "L" and "R"? Or should I just plug the cable to either one? Sorry, I am really new to this. Thanks for the help!

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