MSB Technology The Select DAC User Manual page 13

Mono Powerbase Grounding Diagram
In the configuration you will lift the Grounding lug jumper on both powerbases and then make a
connection between the "Amp Ground" lug on both the powerbases and then add an additional
lead from ONE of your powerbases to ONE of your mono-block amplifiers or to your single stereo
amplfier.
It is important that both grounding lug jumpers are discconected on each of your powerbases to
ensure proper ground isolation.