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BackTRS audio jack horizontal A Series, 5 pole male XLR receptacle, grounding: mating connector shell to pin1 and front panel, vertical PCB mount, retention spring, no latch, https://www.neutrik.com/en/product/nc3fbv1-0 B Series, 3 pole male XLR receptacle, grounding: separate ground contact connected to EP (http://www.aosmd.com/res/packaging_information/DFN5x6_8L_EP1_P.pdf 56-Lead Plastic Quad Flat, No Lead Package (MA) - 2x2x0.9 mm Body [QFN.