Basic Operation
2-13
Using Digital Signals
Several programs in the 480L allow you to increase the
level of the digital signal beyond dBFS. For example, if
the Parametric EQ program is loaded, and a low shelf
filter is boosted +6dB at 250Hz, the potential headroom
to dBFS is reduced accordingly. (See the figure below.)
If the audio material fed through this program contains
a large amount of energy in the region of the shelf
boost, an overload in the digital domain may occur.
When this happens, the last segments of the LARC
display will illuminate.
Many programs, such as Parametric EQ, have a mas-
ter level control which can offset the overall gain to
prevent this situation. If you consistently encounter
such situations, contact Lexicon Customer Service.
dBFS
480L Parametric EQ
Low Shelf +6dB at 250 Hz
20 Hz 200 Hz 2 kHz 20 kHz 20 Hz 200 Hz 2 kHz 20 kHz
+ =
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