ENA2100 - One Channel Mode
From Zenitel Wiki
When One Channel mode is activated, the two loudspeaker channels will play identical audio, and the audio will be in phase. One can then choose to use two separate loudspeaker loops, each with maximum 100W, or one can connect the two output channels together, and use one loudspeaker loop with up to 200W load.
When One Channel mode is used, you would need amplifier license for one channel only.
"One Channel" mode is the same as "Mirror CH1 audio" in the ENA2200 and ENA2400 amplifiers.