Amazon.com: Poyiccot RCA Splitter Male to Male Cable, RCA Y Splitter 1 RCA Male to 2 RCA Male Stereo Audio Subwoofer Cable, 2RCA to 1RCA Bi-Directional RCA Y Adapter Cable - 25cm/10inch :
Straight Wire Symphony II Single RCA to Dual RCA Subwoofer Cable 2.0m - Walmart.com
RCA/phono subwoofer cable, 1 to 1 RCA/phono, digital/analogue – KabelDirekt
RCA Male to Male Gold Stereo Audio Cable - 1.5Feet
RCA Composite Video Subwoofer S/PDIF Cable – Coax 75Feet
RCA Cable, 2-Male to 2-Male RCA Audio Stereo Subwoofer Cable [2Pack,Hi-Fi Sound,Shielded] Auxiliary Audio Cord for Home Theater, HDTV, Amplifiers, Hi-Fi Systems,Speakers- 6 Feet, Top Series - Walmart.com