Sennheiser DW Pro1 Instruction Manual page 19

Putting the headset system into operation
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Adjusting the audio signal/dial tone
Set the ABC switch to A
clear dial tone in the headset.
Adjusting the microphone sensitivity
By default, the microphone volume control
and position 5. This setting is suitable for most telephones and your voice
gets reproduced at a good volume. To change the volume, adjust the
microphone volume control accordingly.
The microphone volume control
sensitivity in Phone
Make a call to someone who will help you find the correct sensitivity
setting for your microphone (see page 25).
Turn the microphone volume control
at a comfortable level.
(default setting), B or C so that you can hear a
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is set to between position
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only adjusts the microphone
mode.
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so that the other party can hear
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