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Hello, You can connect to EITHER one of the subwoofer's Inputs- red or white from the Onkyo. The Onkyo sends a ""Mono" subwoofer signal- so inputting into either one of those jacks gives you full signal from the receiver to the subwoofer. Also, you can use an RCA "Y-splitter" if you want to input to both the Red and White RCA Inputs on the subwoofer (a Y Splitter is at the link below):
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