Extron electronic MVX PLUS 128 manual Operation, cont’d, Reading the displayed volume

Operation, cont’d

Reading the displayed volume

NThis 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 0-to-1, which is 35 dB. At maximum attenuation, no input buttons are lit,

98 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, earlier in this chapter See the table on the next page to read the volume display for each display scheme.

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 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 — 5.5% + 1.5% = 7% volume. The Input 1 button continues blinking slowly.

•Push Esc (>) button twice — 7% + 1.5% + 1.5% = 10% volume. The Input 1 button begins to blink quickly.

•Push Esc (>) button nineteen times — 10% + (19•1.5%) = 38.5% volume. Indicated by the Input 1 through 4 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 reduction 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 98 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 blink slowly. Attenuation is reduced by 35 dB (63 dB of attenuation is applied to the output). There is no change in the volume indication.

•The second step of volume increase reduces the attenuation by an additional 1 dB (62 dB of attenuation is applied to the output). The front panel display is unchanged.

•Successive steps of volume increase cause consecutive input buttons to first blink slowly, then quickly, and then light steadily.

For example: When lit steadily, the Input 3 button indicates 47 dB of attenuation when compared to the Input 3 button blinking quickly (48 dB to 50 dB of attenuation). The blinking Input 4 button (45 dB to 46 dB

of attenuation) is at least 2 dB less than the fast blinking Input 3 button (48 dB – 46 dB) and at most 5 dB less (50 dB – 45 dB).

See the table on page 3-35 to read the volume display.

3-34 MVX Plus 128 VGA Matrix Switchers • Operation