User Guide Manual

3-33
MTPX Twisted Pair Matrix Switchers • Operation
PRELIMINARY
Reading the displayed volume
N
This section is a detailed look at reading the output volume display on the matrix
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13dB.Atmaximumattenuation,noinputLEDsarelit,76
dB of attenuation is applied, and the audio output is effectively muted. At no
attenuation, all input LEDs 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
(audio models)”. Other than the minimum and maximum volume, the switchers
indicatethevolumedifferently,dependingonnumber(16or32)ofinputLEDs.
See the table on the next pages to read the volume display for each display scheme.
For each display scheme, the input LEDs 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% and above,
each Esc (
>
) button 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 16 input buttons — Indicated by the Input 1 LED
blinking slowly.
 Switchers with 32 input buttons — Indicated by the Input 1 LED lit
steadily.
 • Push Esc (
>
) button twice more — 7%+1.5%+1.5%=10%volume
 Switchers with 16 input buttons — Indicated by the Input 1 LED lit
steadily.
 Switchers with 32 input buttons — Indicated by the Input 1 and
Input 2 LED lit steadily.
 • Push Esc (
>
) button 19 times more—10%+(19•1.5%)=38.5%volume
 Switchers with 16 input buttons — Indicated by the Input 1 through
Input5LEDslitsteadilyandtheInput6LEDblinking.
 Switchers with 32 input buttons — Indicated by the Input 1 through
Input 11 LEDs lit steadily and the Input 12 LED blinking.
When all input LEDs 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 LEDs: when fewer input LEDs are lit, attenuation is greater (and the volume
is quieter).
 • Atminimumvolume,allinputLEDsareunlitorbackgroundilluminatedand
76dBofattenuationisappliedtotheoutput.Theaudiooutputiseffectively
muted.
 • TherststepofvolumeincreasecausestheInput1LEDtoblink.
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 LED lights steadily.)