This is the answer from a previous posting. I cut and pasted it into a file on my computer so don't now know who wrote it. VK perhaps?

Master cable (comms + audio) from 568.2MM to Master speaker (usually, but not always, the centre)
Slave cable (comms only) from Master speaker to left main (say).
Master cable (audio only) from 568.2MM to left main.
Slave cable (comms + audio) from left main to right main.


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