- 2 x switching (normalling) stereo jack (T/R/S), https://www.neutrik.com/en/product/nj3fd-v 6.35mm (1/4 in) Vertical Jack, Non-switching mono jack without switching contact, horizontal PCB mount, asymmetric push, https://www.neutrik.com/en/product/nc3fbv1-da B Series, 4 pole chassis connector, black D-size flange, countersunk thru holes, horizontal PCB, https://www.neutrik.com/en/product/nl2md-h speakON Chassis Connectors, 2 pole combination of the rail + a safety margin // margins from edges.