Boulder Amplifiers Integrated Amplifier 865 - Manual (Page 36)

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An 865 set to “SLAVE,” will display “THIS UNIT SLAVE #______.”
If there is no component set to “MASTER,” the 865 will display
“THERE IS NO MASTER!” In this case, the 865’s MASTER/SLAVE
switch should be set to MASTER. It may take up to 30 seconds for the
865 to recognize the switch change.