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Reading the displayed volume
This section is a detailed look at reading the output volume display on the 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 13 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”, on page 48). Other than the minimum and maximum volume,
the switchers indicate the volume differently, depending on number (12, 16, or 32) of input
buttons (see table 6 on the next page to read the volume display for each display scheme).
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 again — 5.5% + 1.5% = 7% volume
• Switchers with 12 and 16 input buttons — The Input 1 button blinks slowly
• Switchers with 32 input buttons — The Input 1 button lights steadily
• Push Esc (
>
) button twice more — 7% + 1.5% + 1.5% = 10% volume
• Switchers with 12 input buttons — The Input 1 button blinks quickly.
• Switchers with 16 input buttons — The Input 1 button lights steadily
• Switchers with 32 input buttons — The Input 1 and Input 2 button light steadily
• Push Esc (
>
) button 19 times more — 10% + (19 times 1.5%) = 38.5% volume
• Switchers with 12 input buttons — The Input 1 through 4 buttons light steadily.
• Switchers with 16 input buttons — The Input 1 through 5 buttons light steadily
and the Input 6 button blinks
• Switchers with 32 input buttons — The Input 1 through Input 11 buttons light
steadily and the Input 12 button blinks
When all input buttons 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 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 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). (On switchers with 32 input buttons the
Input 1 button lights steadily.)
• Successive steps of volume increase cause consecutive input buttons to first blink
and then light steadily. (On switchers with 32 input buttons, each consecutive button
indicates a 1 dB attenuation reduction when blinking and a 2 dB attenuation
reduction when lit.)
MTPX Plus Series • Operation 54