Attaching A Microphone And Adjusting Gain - Lectrosonics MM400C Quick Start Manual

Attaching a Microphone and Adjusting Gain

1) Ensure the battery is in good condition.
2) Insert the microphone plug into the input jack; be sure that the connector
is snug by tightening the threads.
3) Mute the associated receiver's audio output.
4) Turn on the transmitter.
5) Position the microphone in the location you will use in actual operation.
While speaking or singing at the same voice level that will actually be
used, observe the Modulation LEDs. Adjust the AUDIO LEVEL control
until the –20 dB LED glows green with occasional red flickers and -10 dB
glows green. This will set the gain of your transmitter to between +0 dB
Signal Level
Less than -20 dB
-20 dB to -10 dB
-10 dB to +0 dB
+0 dB to +10 dB
Greater than +10 dB
NOTE: The transmitter Audio Level Control should not be used to
control the volume of your sound system or recorder levels. This
adjustment matches the input gain with the user's voice level and
microphone positioning.
Operating Notes
If the audio level is too high — both LEDs will blink red frequently or glow a
steady red. This condition may reduce the dynamic range of the audio signal.
If the audio level is too low — neither LED will glow, or only the -20 LED will
glow green. This condition may cause hiss and noise in the audio.
Different voices will usually require different settings of the AUDIO LEVEL
control, so check this adjustment as each new person uses the system. If
several different people will be using the transmitter and there is not time to
make the adjustment for each individual, adjust it for the loudest voice.
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-20 LED -10 LED
Off
Green
Green
Red
Red
and +10 dB modulation.
(See chart at left.)
Off
Off
6)
Green
has been adjusted, the
audio system audio can
Green
be turned on to make
Red
level adjustments in the
main audio system.
Once the gain
5