Grass Valley Maestro Master Control Installation v.2.4.0 - Manual (Page 179)

MAESTRO Installation and Service Manual 179
3rd Step: Audio Sets
Default DIM Value
Choices range from -10 dB to -30 dB in 1 dB increments.
Default: -20 dB.
This option selects the amount the audio monitor output is attenuated
when the
DIM button is pushed on the control surface. This option is typi-
cally used when the operator answers the telephone or intercom and needs
to quiet the audio monitors but does not wish to change the level control.
Default Monitor Maximum Level
Choices range from 0 dB to -20 dB in 1 dB increments. The Default is 0 dB.
After an NVRamClear, the frame processor will set the Audio Monitoring
level to the value that is configured for the Default Monitor Reference
Level.
Note The channel will also default to Master Fade after an NVRamClear, so no audio
will be heard.
This option selects the maximum output level of the audio monitor out-
puts. Some users prefer to limit the maximum volume permitted in a
control room. Limiting the maximum volume is not suggested since, in a
digital system, optimum signal-to-noise performance is compromised if
the maximum level is not equal to digital full scale (dBFS).
Default Monitor Reference Level
Choices range from -10 dB to -30 dB in 1 dB increments.
Default: -20 dB.
This option selects the default monitor reference level. This level is
achieved when the
Reset button located next to the audio level control is
pushed. The purpose of this button is to provide a reference or standard
level of audio for monitoring. This is especially important in a Dolby Sur-
round system. The default level is -20 dBFS, meaning that the output mon-
itors will have 20 dB of gain above the standard reference level.
Setting this value below -20 dB is not recommended. The preferred monitor
reference level is between -12 dB and -20 dB. In a digital system, main-
taining maximum signal-to-noise ratio requires that normal listening levels
are within 20 dB of digital full scale (dBFS).
Many Dolby Surround systems are designed so that the listening level is -
20 dB below full scale, and power amplifiers are set so that this output level
results in a listening level of between 75 and 85 dB SPL.