Toa A-912MK2 - Manual (Page 13)

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Master volume control knob
Volume control cover YA-920
(accessory)
9. VOLUME CONTROL COVER
To prevent the accidental change of the settings of the Input and Master volume controls, remove the knobs
after setting them to the desired position and attach the optional cover YA-920 instead.
8. OPERATION
Step 1. Press the power switch to turn on the power.
The power indicator lights green.
The amplifier comes into operation about 5 seconds after the power has been switched on.
Step 2. Adjust the individual input and master volume controls for the optimum level. Turn the knobs
clockwise to increase the output level and counterclockwise to decrease it. For normal music playing
or announcement, adjust the input level so that the Normal Indicator intermittently lights. Sound
quality is downgraded when the Peak Indicator remains lit.
Step 3. Adjust the Bass and Treble controls.
Set the Tone Defeat Switch to the OFF position to activate the Bass and Treble controls. The Bass
control boosts low frequencies in clockwise (cw) position and cuts in counterclockwise (ccw) position
while the Treble control boosts high frequencies in cw position and cuts in ccw position. The center
position of both controls provides flat frequency response.
When tone controls are not necessary, set the Tone Defeat Switch to the ON position.