1/4" Stereo Audio Jack Plug Adapter Single Male To Female 6.35mm Dual Mono Stereo Jack Headphone Microphone Y Splitter Converter - Audio & Video Cables - AliExpress
Stereo Mono Audio Converter Box | Stereo Mono Adapter | stereo mono mixer - Home Theatre System - Aliexpress
Poyiccot 1/4 Mono to 3.5mm Stereo Adapter, 3.5mm to 1/4 Adapter Cable, 1/8 to 1/4 Splitter Cable, 3.5mm 1/8 TRS Female to Dual 6.35mm 1/4 TS Male Stereo to Mono Y Splitter Cable, 20cm/8inch