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Amazon.com: Ancable RCA to 3.5mm Mono, [ 2-Pack 3-Feet ] RCA Male to 3.5mm 1/8 inch TS Plug Audio Cable for Speakers, Subwoofer, Trigger Cable for Pre-Amp, Soundbar : Electronics
How to Connect a Subwoofer to a Receiver or Amplifier
Pre Out Vs Line Out - Find the Difference? - ElectronicsHub