Hosa GPM-179 Mini Stereo to Mono 1/4 inch Headphone Adapter | Sweetwater
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
Jack Stereo To Mono Audio Converter Stereo Audio Adapter With Two Isolated Outputs|Home Theatre System| - AliExpress
3.5mm Stereo Male to 3.5mm Mono Female Adapter (TAA Compliant) | Audio Adapters and Couplers | Adapters and Couplers | Audio Video
1/4" Mono Male To 3.5mm Stereo Female Adapter #961 - YouTube