Extron Electronics MVX VGA A User Guide - Manual (Page 48)

3-25 MVX VGA A Matrix Switchers • Operation
PRELIMINAR
Y
Viewing and adjusting the input audio level
The audio level of each input can be displayed and adjusted through a range of
-18 dB to +24 dB to ensure that there is no noticeable volume difference among
sources (figure 3-42). The audio level can be adjusted from the front panel or via
serial port control. The default audio level is 0 dB.
Audio
Inputs
Audio
Inputs
VCR
No noticeable
volume differences
between sources
Audio System
CD Jukebox
MVX 128 VGA A
0
-3
-6
-9
-12
-15
Low Audio
Output Level
+4
+1
-2
-5
-8
-12
-18
-21 -15
-18
3 +7
6 +10
9 +13
12 +16
15 +19
18 +21
21 +24
VU dBu
0
-3
-6
-9
-12
-15
High Audio
Output Level
+4
+1
-2
-5
-8
-12
-18
-21 -15
-18
3 +7
6 +10
9 +13
12 +16
15 +19
18 +21
21 +24
VU dBu
0
-3
-6
-9
-12
-15
Output
Level
+4
+1
-2
-5
-8
-12
-18
-21 -15
-18
3 +7
6 +10
9 +13
12 +16
15 +19
18 +21
21 +24
VU dBu
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
9 10 11 12 INPUTS
OUTPUTS AUDIO VIDEO
I/O CONTROL
ENTER PRESET VIEW ESC
MVX SERIES VGA MATRIX SWITCHER WITH ADSP TM
Figure 3-42 — Audio gain and attenuation
1 . Press the Esc button to clear any input LEDs, output LEDs, or control LEDs
that are lit.
2 . To enter Audio mode, press and hold the Audio button until the LED begins to
blink, then release the button.
3 . Press and release an input button to select an input. The output LEDs display
the audio level for the selected input.
• Switchers with 8 output LEDs — Each output LED indicates 1 dB when
blinking slowly, 2 dB when blinking quickly, and 3 dB when lit steadily.
• Switchers with 16 output LEDs — Each output LED indicates 1 dB when
blinking and 2 dB when lit steadily.
The Esc ( > ) and View ( < ) LEDs display the polarity (gain [+] or attenuation
[–]). See the table on page 3-27 to read the displayed audio level.
4 . Press and release the Esc ( > ) and View ( < ) buttons to increase and decrease
the audio level by 1 dB per each push of the buttons.
Or , press and hold either button to change the level at a rate of 3 dB per
second until the button is released or the upper or lower limit is reached.