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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 :
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Amazon.com: Cmple - One RCA Mono Male to Two RCA Stereo Female Y-Cable, RCA Plug to 2 x RCA Jack Y-Adapter, RCA Speaker Splitter Cab : Electronics
Metra Male RCA Y Adapters (Pair) Multi FI3YM - Best Buy