0.5ft (0.15m) Value Series™ One RCA Mono Male to Two RCA Stereo Male Y-Cable | Audio Adapters and Couplers | Adapters and Couplers | Audio Video
Changing Mono Mics into Stereo with RCA cables by Chung Dha - YouTube
5 Pack 2x RCA Stereo Converter to 3.5mm Mono by Keple, Audio Adapter, Y Splitter, 3.5mm One Ring Male Jack Plug to 2 x RCA Phono Female Connection | Keple.com
1 RCA Male Mono to 2 RCA Female Stereo Audio Splitter A/V Y Cable Lead | eBay