If you were to wire a 4 pin audio cable to a 3 pin jack which two wires would be joined? Eg. TP120 jack being replaced with a 3.5mm jack. - Quora
![3.5 mm stereo jack wiring diagram.|Earphone wire information.Audio jack, Headphone jack repair - YouTube 3.5 mm stereo jack wiring diagram.|Earphone wire information.Audio jack, Headphone jack repair - YouTube](https://i.ytimg.com/vi/SUivVC2bMVQ/maxresdefault.jpg)
3.5 mm stereo jack wiring diagram.|Earphone wire information.Audio jack, Headphone jack repair - YouTube
![3.5mm headphone jack wiring installing on amplifier ; high impedance headphones are recommended - YouTube 3.5mm headphone jack wiring installing on amplifier ; high impedance headphones are recommended - YouTube](https://i.ytimg.com/vi/EfiAQ7yq12s/maxresdefault.jpg)