Can 1/4", powercon, ethercon, MIDI and USB jacks be installed on this R1269/1UK/12 panel as well, or is it only compatible with XLR and speakon jacks? thanks!

The R1269/1UK/12 is designed to be used with the Neutrik D-series range of chassis connectors. If you use the Neutrik ethercon, midi and USB then this is suitable.
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