Clear-Com RS-603 (No longer available) - Manual (Page 37)

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ratio in high-noise environments. This setting reduces the amount of ambient
noise that travels to the intercom channel when a beltpack’s microphone is on.
Typically, you choose “low gain” for an electret microphone because of the
microphone’s stronger audio signal. A dynamic microphone requires the
high-gain setting, which is the default.
Figure 8: Main headset microphone options for a 2-channel beltpack
M ICROPHONE G AIN
The setting on the microphone gain scale determines how loud your voice
sounds on the intercom line. To increase the volume, move the slider to the right
on the scale. To decrease the volume, move the slider to the left on the scale.
The default setting for gain is at the maximum gain level. The maximum gain
level varies for each beltpack model.
The range differs for electret and dynamic microphones. The correct range
appears on the screen when you select one of those options. The default settings
are appropriate for a dynamic microphone.
Mic sensitivity varies with different brands and models of headsets, as well as
such factors as the user’s distance from the microphone and the loudness of the
user’s voice. Adjusting the microphone’s gain helps to compensate for these
factors.
M ICROPHONE R ESPONSE
Flat When you select this feature, microphone’s audio frequency response is flat.
Intelligibility Contour When you select this feature, the beltpack contours the
audio frequency response to increase the clarity of your voice. All Clear-Com
applications use this feature and it is the beltpack’s default setting for all modes
except RTS mode.
Do not select Intelligibility Contour if your beltpack is configured for RTS-TW
systems.
AUXILIARY HEADSET MICROPHONE OPTIONS
All RS-600 series beltpacks provide a 2.5 mm jack for connecting a Clear-Com
CC-25 headset or similiar ultra-light headset. The gain of this circuit is
optimized to match the Clear-Com CC-25 headset’s microphone.