Toa AV-20D, Operating Instructions Manual

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7. OPERATION
After completing all audio and control connections, connect the power supply, and check the power indicator.
Note
When the heat sink temperature exceeds 130°C (266 °F), the protection circuit begins to operate to disconnect
the output from the circuit. The disconnected output is automatically restored as soon as the temperature
returns to the normal operating range.
8. INSTALLATION PRECAUTIONS
CAUTION
Keep the amplifier over 10 cm (3.94") away from
objects that may obstruct air flow to prevent the
unit's internal temperature rise.
9. ADJUSTMENT
9.1. Input Sensitivity Selection
Output level are adjustable with master volume control and individual -10dBV/-20dBV switches.. For music play
or announcement, adjust the proper volume control or sensitivity so that the signal indicator lights intermittently.
Note that the sound quality is downgraded when the peak indicator remains lit.
For those audio source equipments which always have relative high output level, such as CD players, please
set the input sensitivity selection switch to -10dBV position; otherwise, set to -20dBV position.
9.2. Output Volume Setting
Output level are adjustable with master volume control and individual -10dBV/-20dBV switches. For music play
or announcement, adjust the proper volume control or sensitivity so that the signal indicator lights intermittently.
Note that the sound quality is downgraded when the peak indicator remains lit.
When a Remove Volume Control is connected, Attenuating the value of the potentiometer will reduce the
volume level. This attenuation works for the audio signal after adjusted by its master volume control.
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