Sennheiser HMD 46 Instruction Manual page 7

Adjusting the volume directly on the audio system
CAUTION!
Hearing damage due to high volumes!
This headset is capable of producing high sound pressure
levels. Higher volumes or longer durations can damage
your hearing!
Set the volume to a medium level. Make sure that
you can hear critical sounds such as warning alarms.
Connect the headset to the corresponding sockets of your
audio system. Adjust the volume directly on the audio
system.
Adjusting the microphone sensitivity
The microphone sensitivity has been factory preset to
80 mV/Pa. You can change the microphone sensitivity by
turning a small screwdriver in the direction of the arrow.
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