BSS Audio FDS366T OMNIDRIVE User Manual page 26

Dynamic Equalisation
Dynamic bass and treble enhancement
The bass and treble content of the program can be made to appear louder
without increasing the overall sound level if the middle frequencies of the
program are reduced when the sound level approaches the limit. This can be
especially useful to squeeze the last few dB of perceived headroom out of a
PA.
The parametric equaliser associated with the Dynamic Equaliser is much like
the other EQs in the FDS-366T (and may in fact be used as a conventional
equaliser if DEQ is set to "Off".
As the sidechain of the compressor is fed from the equaliser, this endows the
DEQ with the unique ability to select a portion of the audio band and
compress only that band.
To do this:
1
Set the EQ parameters to boost at the appropriate frequencies, using
either BELL filter shape, or probably more aptly, LO-SHELF for the LF
end or HI-SHELF for the HF end.
2
Set the threshold ("Thr") parameter so that the boost/cut bargraph starts
to go upward at the desired level.
3
Adjust the ratio control for the correct amount of compression.
For more information on setting Dynamic Equalisation please refer to the DEQ
descriptions in the Input and Output sections of this manual.
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FDS-366T