RCA 1 Female to 2 Male Adapter Audio Y Splitter Cable Amplifier Subwoofer - Walmart.com
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 :
RCA/phono subwoofer cable, 1 to 1 RCA/phono, digital/analogue - KabelDirekt