SUPRA Sublink RCA-RCA mono subwoofer cable 15-meter (49.2 feet) MADE IN SWEDEN ! | eBay
Eagle Cable Deluxe II Mono Subwoofer kabel | Perfect Things
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