Extron electronic MAV Plus, 450 Plus 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 a maximum of 98 dB of volume attenuation available, that 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, 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 (systems with audio BMEs). See the table on the next page to read the volume display for each display scheme.

The input buttons 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 push of the Esc (>) button 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% + (19•0.75%) = 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 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 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.

3-36 CrossPoint 450 Plus and MAV Plus Switchers • Operation