Toa M-9000M2 CE-AU - Manual (Page 20)

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6.1.2. Output volume settings
Step 1. For "BASS" and "TREBLE" settings, use the pull-down menu and check the "Loudness" checkbox.
Step 2. Adjust the level with the fader.
The fader can be set within the range of "OFF, –70.0 dB through 10.0 dB" in 0.5 dB units.
Step 3. Repeat Steps 1 and 2 for each of the channels to be set.