hardware - Does professional quality stereo to mono conversion require a special adapter - Sound Design Stack Exchange
Acheter 1x 2/3pole 6.5mm 6.35mm male female Jack Plug to 3.5mm male female Audio mono stereo converter Connector for Headphone Amplifier | Joom
1/4" Stereo Audio Jack Plug Adapter Single Male to Female 6.35mm Dual Mono Stereo Jack Headphone Microphone Y Splitter Converter
Monoprice 3.5mm TS Mono Plug to 3.5mm TRS Stereo Jack Adapter, Gold Plated - Monoprice.com
Single Channel) - DC 3.5mm to 6.35mm Mono Cable - 6.35mm 1/4 inch Mono Jack Socket to 3.5mm 1/8" Mono Jack Plug Audio Adapter Converter Cord 0.3m (Single Channel) : Amazon.fr: High-Tech
3.5mm Stereo to 2x Mono Audio Splitter Adaptor | PC Audio Splitter – DJ Supplies Sound and Lighting Ltd