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Through-hole, https://www.cui.com/product/resource/sj1-353xng.pdf TRS 3.5mm, vertical, Thonkiconn, PCB mount, https://www.neutrik.com/en/product/nc3fahr2 A Series, 4 pole chassis connector, grey D-size flange, countersunk thru holes, horizontal PCB, https://www.neutrik.com/en/product/nl2md-h speakON Chassis Connectors, 4 pole male XLR receptacle, grounding: mating connector shell and front.