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3-21MAV 44 / 48 / 84 / 88 Matrix Switchers • Operation
Example 8: Adjust the input audio gain
The following steps show an example in which an input audio level is viewed and
adjusted. The example shows the front panel indications that result from your
actions.
1. Press and hold the Audio Setup (I/O) button for approximately 2 seconds
(figure 3-32) until the Audio Setup LED lights.
AUDIO SETUP AUDIO SETUP
The LED lights to indicate Audio Setup mode
.
Release the Audio Setup button
.
2 seconds
P
ress and hold the button.
Figure 3-32 — Select Audio Setup mode
2. Press and release the Input 5 button (figure 3-33).
VU
3
3
0
+
6
10
2
1
4
3
OUTPUTS
6
5
4
INPUTS
+dB
-dB
The Output 1, Output 2, and Output 3
LEDs display input 5's audio level range.
The +dB LED indicates
a gain (positive) level.
The power LED lights
steadily or blinks off only
occasionally to indicate
that the adjusted level is
too high.
A VU meter connected
to output 1 indicates
that the adjusted level
is approximately +9 dB
above the –10 dBV
internal level.
In this example, the LEDs indicate gain in the +6 dB to +10 dB range.
Press and release the Input 5 button.
T
he Input 5 LED lights to
i
ndicate that input 5 is selected.
= lit, = unlit,
= blinking LED
Figure 3-33 — Select an input
If the +dB and –dB LED are both lit they indicate an input gain of 0 dB.
Otherwise, you can determine the exact gain or attenuation using the
following procedure.
a. If one or more output LEDs are lit AND the +dB LED is lit, press and
release the
button repeatedly until the highest-numbered lit output
LED goes out. Count the button presses. In example 8, assume a value
of +8 dB. It takes three presses of the button for the Output 1 LED to
go out.
If one or more output LEDs are lit AND the –dB LED is lit, press and
release the
button repeatedly until the highest-numbered lit output
LED goes out. Count the button presses.
If the +dB LED is lit and NO output LEDs are lit, press and release the
button repeatedly until the +dB and –dB LED are both lit, indicating
0 dB. Count the button presses.
If the –dB LED is lit and NO output LEDs are lit, press and release the
button repeatedly until the +dB and –dB LED are both lit, indicating
0 dB. Count the button presses.