Menu Screen Details; Top Menu; Input Menu; Adjusting The Input Gain - Lectrosonics DBSM Instruction Manual

DBSM-A1B1, DBSM/E01-A1B1, DBSMD-A1B1, DBSMD/E01-A1B1

Menu Screen Details

Top Menu

From the Default screen, pressing MENU/SEL will ac-
cess the Top Menu. The Top Menu allows the user to
access the various sub-menus to control the unit.
TopMenu TopMenu
Input TCode
Xmit IR&Key
Compat Setup

Input Menu

From the TopMenu, use the
highlight INPUT and press MENU/SEL.
Input...
Gain
Rolloff
Polarity

Adjusting the Input Gain

The two bicolor Modulation LEDs on the control panel
provide a visual indication of the audio signal level
entering the transmitter. The LEDs will glow either red
or green to indicate modulation levels as shown in the
following table.
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: Full modulation is achieved at 0 dB, when
the "-20" LED first turns red. The limiter can cleanly
handle peaks up to 30 dB above this point.
It is best to go through the following procedure with the
transmitter in the standby mode so that no audio will en-
ter the sound system or recorder during adjustment.
1) With fresh batteries in the transmitter, power the unit
on in the standby mode (see previous section Turn-
ing Power ON and OFF).
2) Navigate to the Gain setup screen.
10
and arrow buttons to
-20 LED -10 LED
Off Off
Green Off
Green Green
Red Green
Red Red
Gain
25
-40 -20 0
3) Prepare the signal source. Position a microphone
the way it will be used in actual operation and have
the user speak or sing at the loudest level that will
occur during use, or set the output level of the in-
strument or audio device to the maximum level that
will be used.
4) Use the
and arrow buttons to adjust the gain
until the –10 dB glows green and the –20 dB LED
starts to flicker red during the loudest peaks in the
audio.
5) Once the audio gain has been set, the signal can
be sent through the sound system for overall level
adjustments, monitor settings, etc.
6) If the audio output level of the receiver is too high or
low, use only the controls on the receiver to make
adjustments. Always leave the transmitter gain ad-
justment set according to these instructions, and do
not change it to adjust the audio output level of the
receiver.

Selecting the Low Frequency Roll-off

It is possible that the low frequency roll-off point could
affect the gain setting, so it's generally good practice to
make this adjustment before adjusting the input gain.
The point at which the roll-off takes place can be set to:
• LF 20 20 Hz
• LF 35 35 Hz
• LF 50 50 Hz
• LF 70 70 Hz
The roll-off is often adjusted by ear while monitoring the
audio.
.
Rolloff
Input...
Gain
Rolloff
Polarity
• LF 100 100 Hz
• LF 120 120 Hz
• LF 150 150 Hz

70 Hz
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