Polk SUB PSW-10

I recently purchased a used Polk subwoofer, the PSW-10. I have an older receiver, Pioneer VSX-5700S, which doesn't have a specific subwoofer port (RCA connection) on back like many newer receivers do. What is the best way to wire my new sub to this receiver? I am using four speakers...two Bose 301 and 2 Advent Heritage.
Thank you

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