User guide

Audio Gain and Attenuation Adjustments
Individual audio inputs can be adjusted over a range
of -18 dB to +24 dB using the program audio mute
button and program audio volume control knob.
These adjustments can be used to normalize
the input audio levels so that output volume is
consistent for all inputs.
The front panel input LEDs provide a status of
the current input gain/attenuation levels. When
adjusting the audio level, the LEDs used for inputs
1-8 (VGA inputs 1-2, DVI inputs 1-2, HDMI inputs
1-3, and video input 1) function as indicators of the
current audio level for the selected input as shown
in the table.
The LED input associated with video Input 2
functions as an indicator of gain (+) or attenuation
(–). If Input LED 9 (video input 2) is off, audio is
at a positive level (gain). If the LED is on, audio is
negative (attenuated).
To adjust the input audio level from
the front panel:
1. Press and hold the Program Audio Mute AND
Mic mute buttons for 3 seconds. The two Mute
LEDs flash three times.
2. Press the input button for the audio to be
adjusted. If no input button is pressed, the
switcher times out and exits audio level
adjustment mode.
3. Once the input button is pressed, the front
panel input LEDs indicate the current gain or
attenuation setting. Factory default is 0 dB (all
LEDs off). Rotate the Program volume knob
clockwise to increase and counterclockwise to
decrease the audio level. The front panel LEDs
display the level setting as the knob is adjusted.
4. Once the desired level is achieved, to adjust
another input, select it within 3 seconds. If
audio adjustments are complete:
a. Do not press any front panel buttons for at
least 3 seconds to exit the gain/attenuation
mode, or
b. Press the program audio and Mic mute
buttons to exit the gain/attenuation mode.
At any time during the adjustments, if front panel
buttons are not pressed or the program knob is not
rotated for 3 seconds, the switcher times out and
the gain/attenuation mode is exited.
S
F
S
F
S
F
S
F
S
F
S
F
S
F
S
F
S
F
S
F
S
F
S
F
S
F
S
F
Front Panel LEDs
VGA Input 1 VGA Input 2 DVI Input 1 DVI Input 2 HDMI Input 1 HDMI Input 2
HDMI Input 3 Video Input 1 Video Input 2
87654321
= on, = blinking fast, = blinking slowly, = off
9
S
F
-10
-11
-12
-13
-14
-15
-16
-17
-18
+9
+8
+7
+6
+5
+4
+3
+2
+1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
+18
+17
+16
+15
+14
+13
+12
+11
+10
+24
+23
+22
+21
+20
+19
8
7
dB
6
5
4321 9
MPS 409 • Operation 16