Toa M-9000M2 CE-AU - Manual (Page 32)

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ANC LEVEL: Sets the input sensitivity of the ambient noise detection microphone.
RANGE: Sets the variation range of the output level using the ANC.
SAMPLE TIME: Sets the measurement time for ambient noise.
RATIO INPUT SIGNAL: Sets the ratio of the ambient noise level change to the output level change.
OUTPUT CHANNEL:
Sets the ANC enabled-output channels.
MONITOR OUT: Sets the channels for monitoring ambient noise.