Gain/Adjusting The Inut Gain; Rolloff; Phase (Selecting Audio Polarity); Setting Frequency - Lectronics DBu Instruction Manual

DBu, DBu/E01
Menu Item Descriptions
Input
Gain
Gain can be set, from -7 to +44, by using the
arrow buttons.
Adjusting the Input Gain
The two bicolor Modulation LEDs on the top panel pro-
vide 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
enter 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
Powering On in Standby Mode on page 6).
2) Navigate to the Gain setup screen.
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 oc-
cur during use, or set the output level of the instru-
ment 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
8
-20 LED -10 LED
Off Off
Green Off
Green Green
Red Green
Red Red
Gain
25
-40 -20
0
gain adjustment set according to these instruc-
tions, and do not change it to adjust the audio
output level of the receiver.
Rolloff (Low Frequency Roll-off)
The low frequency audio roll-off is adjustable to optimize
performance for ambient noise conditions or personal
preference.
and
Low frequency audio content may be desirable or dis-
tracting, so the point at which the roll-off takes place can
be set to 20, 35, 50, 70, 100, 120 or 150 Hz.

Phase (Selecting Audio Polarity)

This setting allows for configuration for use with certain
microphones, or for setting custom parameters.
Xmit

Setting Frequency

Frequency (mHz and kHz) in can be set by using the
MENU/SEL button to choose mHz or kHz and the
arrows to adjust frequency.
Tuning Groups
Tuning groups can be received via IR (Infared) port sync
from a receiver. The group frequencies are set by the re-
ceiver. The group names will be displayed at the bottom
of the screen as Grp x, Grp w, Grp v, or Grp u.
Use the MENU/SEL button to toggle between options
and the

Rolloff

70 Hz
Phase
Normal
Inver t
and arrow buttons to adjust.
LECTROSONICS, INC.
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