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
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Connect 3.5 mm Headphone (4 pins) to Stereo audio jack | Mobile to woofer system connector cable - YouTube
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Making a [4-Pole TRRS to 3.5mm Stereo & Mic Adapter (Male to 2x Female)] from an iphone headphone split… | Earphones wire, Electronic schematics, Headphone splitter
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