Is your sub self-powered ("active")? If yes, run wires:
- from your AVR's L+R speaker-level outputs to the sub's L+R speaker-level inputs;
- from the sub's L+R speaker-level outputs to the L+R speakers.
And, in the AVR's speaker set-up menu, set "subwoofer" to "none".
If your sub is not self-powered ("passive"), you'll need a separate subwoofer amp. Run an RCA connection from your AVR's subwoofer output to the subwoofer amp, and run wires from the subwoofer amp to your sub.
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