Surround 5.1 speaker set-up with Harman Kardon AVR 120
receiver has single RCA-type subwoofer output. Subwoofer has
dual-right/left RCA input and output connections OR speaker terminals.
You have it upon one of several truly odd "standards" in the AV industry but the answer is simple if not quite logical. You will use an RCA type cable from the Sub out or LFE on the receiver to just one of the two inputs on the subwoofer. I usually use the one on the right but it really doesn't matter. The other connectors would be for a system with out a sub out where the speaker wire would be run first to the subwoofer and then out to the speakers. This will not be used at all in your case.
Enjy!
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