Extron Electronics MPX Plus 866 A Rev. B - Manual (Page 142)

Switcher Software, cont’d
MPX Plus 866 A Media Presentation Matrix Switcher • Switcher Software 5-36
PRELIMINAR
Y
Setting group master soft limits
• Shift in a combination moves the upper limit —

Shift-Up/down arrow
Shift
or
Shift
— Moves the soft upper limit in
0.1 dB increments.

Shift-Page Up/Page Down arrow
Shift Page
Up
or
Shift Page
Down
— Moves the soft
upper limit in 10 dB increments.

Shift-Home
Shift Home
— Moves the soft upper limit to the upper default.

Shift-End
Shift End
— Moves the soft upper limit to the fader’s position.
• Ctrl in a combination moves the lower limit —

Ctrl-Up/down arrow
Ctrl
or
Ctrl
— Moves the soft lower limit in
0.1 dB increments.

Ctrl-Page Up/Page Down arrow
Ctrl Page
Up
or
Ctrl Page
Down
— Moves the soft lower
limit in 10 dB increments.

Ctrl-Home
Ctrl Home
— Moves the soft lower limit to the fader’s position.

Ctrl-End
Ctrl End
— Moves the soft lower limit to the lower default.
Optimizing the Audio
Program material that you are familiar with is preferable for the following
procedures, otherwise, pink noise can be used.
T The Extron VTG 300 or VTG 400 is recommended to provide the pink noise.
Input clipping and clipping meters
Audio clipping is a form of distortion that occurs when the signal peaks (or
excursions) exceed the limits of the circuit, cutting off the excursions of a signal.
This condition gives audibly undesirable results. While it is difficult to clip the
audio signal within the DSP audio signal chain, it is extremely important that the
audio signal is not clipped before the input to the switcher. Once audio is clipped
at the input, there is no remedy further down the signal chain. However, if audio
clipping occurs at the output of the DSP that is not a result of clipping at the input,
this can be addressed in the DSP audio signal chain.
Meters are available in the gain controls ( ) and in the dynamic processor
blocks ( ) when the program is in Live mode and an audio signal is applied to the
DSP. The meters in the DSP Configurator program indicate clipping at a user-
definable level, with the default setting at -1 dB. At the -1 dB setting, the meter
indicates clipping when it reaches -1 dBFS, or 1 dB below actual clipping. Setting
the clipping meter below actual clipping provides a bit of a “safety net”, letting you
know to pull back on input gain before clipping actually occurs. You can increase
or decrease this safety net by clicking Tools>Options, selecting the Gain Defaults
tab, and setting the clip threshold to a number between
0 dB and -20 dB. When the clip threshold is set to 0 dB,
clipping is indicated only when actual clipping occurs.
Meters within the DSP Configurator program are peak-
type meters, referenced to “full scale,” or 0 dBFS. For the
MPX Plus 866 A, 0 dBFS corresponds to 22 dBu, which is
the maximum output level of the switcher.