Extron Electronics MVX VGA A User Guide - Manual (Page 54)

3-31 MVX VGA A Matrix Switchers • Operation
PRELIMINAR
Y
Reading the displayed volume
N This section is a detailed description at reading the output volume display on the
matrix switcher’s front panel. If you do not need to read the exact value of the
volume setting, skip this section.
There are 65 steps of volume attenuation, with 1 dB per step (button press),
except for 0-to-1, which is 13 dB. At maximum attenuation, no input LEDs are
lit, 76 dB of attenuation is applied, and the audio output is effectively muted. At
no attenuation, all input LEDs are lit, and the output volume is equal to the input
signal plus any gain or attenuation that is applied to that specific input using the
input audio level adjustment. (See “Viewing and adjusting the input audio level”,
on page 3-25). Other than the minimum and maximum volume, the switchers
indicate the volume differently, depending on number (12 or 16) of input LEDs. See
the table on the next page to read the volume display for each display scheme.
For each display scheme, the input LEDs blink or light sequentially to indicate the
approximate volume of the selected output. Volume is defined as a percentage of
the input audio signal that is applied to the output. From 0% of volume, the first
Esc ( > ) button press applies 5.5% of the input audio signal. From 5.5% on, each
Esc ( > ) press applies 1.5% more of the input audio signal to the output:
• Press Esc ( > ) button — 5.5% + 1.5% = 7% volume

All switcher input button configurations —The Input 1 LED continues
blinking slowly.
• Press Esc ( > ) button twice — 7% + 1.5% + 1.5% = 10% volume

Switchers with 12 input buttons — The Input 1 LED blinks quickly.

Switchers with 16 input buttons — The Input 1 LED lights steadily.
• Press Esc ( > ) button 19 times — 10% + (19•1.5%) = 38.5% volume

Switchers with 12 input buttons —The Input 1 through 4 LEDs light
steadily.

Switchers with 16 input buttons — The Input 1 through 5 LEDs light
steadily and the Input 6 button blinks.
When all input LEDs are lit for any switcher model, the audio output is 100% of the
audio input level.
Another way to view the volume level is to think in terms of the attenuation that
is applied to the output. Attenuation reduction is indicated by the lit or blinking
input LEDs: when fewer input LEDs are lit, attenuation is greater (and the volume
is quieter).
• At minimum volume, all input LEDs are unlit and 76 dB of attenuation is
applied to the output. The audio output is effectively muted.
• The first step of volume increase causes the Input 1 LED to blink (slowly, in
the case of switchers with 12 input buttons). Attenuation is reduced by 13 dB
(63 dB of attenuation is applied to the output).
• The second step of volume increase reduces the attenuation by an additional
1 dB (62 dB of attenuation is applied to the output).
• Successive steps of volume increase cause consecutive LEDs to first blink,
then light steadily.