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 Y cable, 1 to 2 RCA/phono, stereo coax audio cable - KabelDirekt
SVS Gold RCA Y Adapter
Rca Ah25r Rca Y-adapter (1 Male To 2 Females) - Walmart.com
Metra Male RCA Y Adapters (Pair) Multi FI3YM - Best Buy