Extron Electronics MAV Plus series Large Scale User Guide - Manual (Page 71)

3-39 CrossPoint 450 Plus and MAV Plus Switchers • Operation
Reading the displayed volume
N This section is a detailed look at reading the output volume display on the
switcher’s front panel. If you do not need to read the exact value of the volume
setting, skip this section.
There is a maximum of 76 dB of volume attenuation available. The attenuation is
adjustable in steps of 0.5 dB, except for the first step from full attenuation, which is
34.5 dB.
• At maximum attenuation, no input buttons are lit, 76 dB of attenuation is
applied, and the audio output is effectively muted.
• At no attenuation, all input buttons 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 (systems with audio BMEs)”.
The input buttons 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 push
applies 4.75% of the input audio signal and the Input 1 button flashes. From 4.75%
on, each Esc ( > ) button push applies 0.75% more of the input audio signal to the
output and the number of output buttons flashing or lit increases:
• Push Esc ( > ) button — 4.75% + 0.75% = 5.5% volume, indicated by the
Input 1 button lit steadily.
• Push Esc ( > ) button three more times — 5.5% + 0.75% + 0.75% + 0.75% =
7.75% volume, indicated by the Input 1 and Input 2 buttons lit steadily and
the Input 3 button flashing.
• Push Esc ( > ) button nineteen more times — 7.75% + (19x0.75%) = 22%
volume, indicated by the Input 1 through Input 12 buttons lit steadily.
When all input buttons are lit, 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 is indicated by the lit or blinking input buttons:
when fewer input buttons are lit, attenuation is greater (and the volume is quieter).
• At minimum volume, all input buttons are unlit or background illuminated
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 button to flash.
Attenuation is reduced by 34.5 dB (63.5 dB of attenuation is applied to the
output).
• The second step of volume increase reduces the attenuation by an additional
0.5 dB (62.5 dB of attenuation is applied to the output). (The Input 1 button
lights steadily.)
• Successive steps of volume increase cause consecutive buttons to flash and
then light. Each consecutive lit button indicates a full 1 dB of attenuation
reduction .
• The buttons’ volume indications are additive. For example: Input 1 lit
([34.5 dB + 0.5 dB] of attenuation reduction) and Input 2 lit ([0.5 dB + 0.5 dB]
of attenuation reduction) indicate that the output attenuation has been
reduced by a total of 36 dB: (34.5 dB + 0.5 dB + 0.5 dB +0.5 dB = 36 dB).
• At full volume, no attenuation is applied to the output and all input buttons
are lit steadily.
See the table on the next page to read the volume display for each display scheme.