Revolabs Fusion Setup Guide - Manual (Page 23)

Hearing Assistance
Setting the Hearing Assistance Option
All Microphones Hear Audio From the Far End (default)
If an earpiece is plugged into any of the microphones, the user will hear the far
end of the audio only. DIP switch #8 is OFF (page 18).
Hear Audio From Both Far End and Within The Room
If the user needs to hear the audio from both the far end and the other
microphones within the room, he/she must use the microphone paired to
Channel 8 (refer to pairing mode page 9) and the DIP switch #8 must be set to
ON (page 18). Please note that the Room Out RCA plug will no longer
function in this mode; Aux Out will serve as Room Out.
NOTE: The Fusion system must be powered off and back on for any
DIP Switch changes to take effect.
Page 23
Revolabs Fusion™