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BackHorizontal jack stereo horizontal TRS 3.5mm, vertical, Thonkiconn, PCB mount, https://www.neutrik.com/en/product/nc3faav1 AA Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, horizontal PCB mount, replaces NL2MD-V, https://www.neutrik.com/en/product/nl2mdxx-v speakON Chassis Connectors, 4 pole male XLR receptacle, grounding: mating connector shell to pin1 and front panel, horizontal.