LAWO mc256 MKII, Техническое руководство

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mc²56 MKII Technical Manual V5.10.2/1 88
Chapter 2: Installation
System Settings
Level Options
This topic can be used to change the system's reference level, headroom or overload threshold. The levels affect
the maximum analogue level from your system according to the following equation:
·
Maximum Analogue Level = Reference Level + Headroom
The system supports a maximum analogue level = +24dB, and a minimum analogue level = +12dBu.
Warning
Changing the Reference Level or Headroom options move the internal 0dB operating point for the system
and therefore will change the behaviour of any level dependent settings such as dynamics processing and
metering. Therefore, it is not advisable to alter these levels once dynamics processing has been set.
For systems fitted with fixed level analogue I/O cards:
·
The Headroom and Reference Level cannot be altered independently. For example, with a
+15dBu fixed analogue I/O card and +9dB Headroom , the Reference Level must be +6dBu.
·
The Maximum Analogue Level of the whole system is defined by the DALLIS card with the lowest
GDA (General Device Address) - this is the card with the lowest address fitted to the DALLIS frame
connected to the lowest port number of the first Nova73. (If a different fixed level analogue card is
fitted elsewhere within the system, then a warning appears in the log file; however, the card with the
lowest GDA still wins.)
Reference Level
Sets the reference level of your analogue interfaces in dBu. Reference level can be set from 0dBu to +24dBu,
depending on the
Headroom .
Headroom
Sets the operating headroom to the external world; this is the difference between the analogue reference level and
digital full scale (0dBFS). Headroom can be set from 0dB to +20dB depending on the
Reference level .
Note that the internal Headroom is more then 380dB which means, if you route from input to group to group to
sum, you can overdrive the level more then 380dB before clipping!