By taking an ML input and providing the speaker output as an input to an MCL2 distribution system – this is the purpose for which it was introduced (i.e: adding a new ML audiomaster to an existing MCL2 distribution system). The converter’s speaker sockets actually each have an extra pin to provide data and power according to the diagram here: https://www.beoworld.co.uk/beotech/wiring1.htm They would then supply MCL2As (with IR eyes) in each MCL room/zone.