Extron electronic MPX PLUS 866 A Switch User Manual


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MPX Plus 866 A Media Presentation Matrix Switcher • Operation
PRELIMINARY
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 are 65 steps of volume attenuation, with 1 dB per step (button push), except
for step 0-to-1, which is 37 dB. At maximum attenuation, no input buttons are lit,
100 dB of attenuation is applied, and the audio output is effectively muted. At no
attenuation, input buttons 1 through 12 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”.
See the table on the next page. The input buttons blink or light sequentially to
indicate the approximate volume of the selected output. Volume is defined as
a per
centage of the input audio signal that is applied to the output. From 0% of
volume, the first Esc (
>
) button push applies 5.5% of the input audio signal. From
5.5% on, each Esc (
>
) push applies 1.5% more of the input audio signal to the output:
• Push Esc (
>
) button again — 5.5% + 1.5% = 7% volume, indicated by the
Input 1 button blinking slowly.
• Push Esc (
>
) button twice more — 7% + 1.5% + 1.5% = 10% volume,
indicated by the Input 1 button blinking quickly.
• PushEsc(
>
) button nineteen times more —10%+(19•1.5%)=38.5%
volume, indicated by the Input 1 through 4 buttons lit steadily.
When 12 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 the audio output is effectively muted.
• TherststepofvolumeincreasecausestheInput1buttontoblinkslowly.
Attenuation is reduced by 37 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buttonstorstblink,
then light steadily.
• Atfullvolume,noattenuationisappliedtotheoutputandallinputbuttons
light steadily.
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