Lectrosonics Quadra - Manual (Page 14)

QUADRA
PRE-GAIN
Limiter
This feature can be used in order to provide audio lim­
iting at the receiver in order to prevent excessive levels
at the headphones or earbuds. To set the amount of
limiting, highlight “Limiter” in the menu list using the ar­
row keys. Press MENU/SEL to choose this function.
OUTPUT LEVEL
Use the arrow keys to select the limiter threshold in
3 dB increments. Test it with a known signal to deter­
mine the maximum sound level you are comfortable
with. The pre-gain setting can then be used to boost
the audio level ahead of the limiter. Use this feature if
you need to make up for weaker audio input levels at
the transmitter. Use the MENU/SEL button to choose
“Pregain”, then use the arrow buttons to adjust in 3 dB
increments.
Pre-Gain
This adjustment is used in conjunction with the Lim­
iter setting to control the overall dynamic range ot the
audio being heard. As the Pregain setting is increased
and the Threshold setting is decreased, the dynamic
range is compressed as shown in the diagram. When
set for maximum compression, the audio being heard
will be at the same loudness regardless of how loud
the input signal becomes.
-0 dB
-3 dB
-6 dB
-9 dB
-12 dB
-15 dB
-18 dB
+12 dB
+9 dB
+6 dB
+3 dB
INPUT LEVEL
THRESHOLD
Backlight
The backlight control page allows you to select the
length of time before the backlight turns off on the re­
ceiver. The factory default setting is 5 minutes, but you
can also select 30 seconds or Always on.
Treble Shelf
In this screen, you can choose a treble boost with a
corner either at 5kHz or 7kHz, and a boost of up to 9
dB in 3 dB increments. Treble shelf can be used to
compensate for a stereo mix that is lacking high fre­
quency information, or earbuds that “roll off” too early
in the high frequency area.
This high-frequency boost should be used sparingly
due to the fact that it can accelerate hearing loss with
high volumes in the earphones or headphones.
Note: the factory default setting is 5 kHz corner
with 0dB boost.
Lock Setup
This feature is used to lock the control panel so that
no further changes can be made, other than normal
adjustments to the upper mixing knobs. Once Locked
is selected, note that a small lock icon appears in the
upper right of each setup menu screen. With the re­
ceiver locked, you can view each menu screen but you
are unable to make changes and the power can not be
turned off.
To return to the unlocked status, go back to the Lock
Setup screen via the main menu, and select Un­
locked. Also, note that the Locked status is main­
tained even if the batteries are changed.
LECTROSONICS, INC. 14