Specifications
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NEW Button
Click on the NEW button to generate a new parametric filter. Each new parametric filter
initially appears at 1 KHz, 0 dB, 2/3-octave. The number of remaining filters is displayed
below the NEW button.
Clear Button
Click on the CLEAR button to clear the filters. A dialog box will come up prompting you to
clear one filter, all filters, or the entire block. Click on the CLEAR ONE to clear only the currently
selected filter, the CLEAR ALL FILTERS button to clear all filters, or CLEAR ALL FILTERS AND
GAIN to clear all filters plus the Output Gain control. Then click on the OK button. The Clear func-
tion is active even if LOCK filters is active.
High- and Low-Frequency Roll-Off/Shelf Filters
Like the graphic equalizer, the parametric equalizer offers both high- and low-frequency filters.
These are the filter squares labelled “H” and “L” — that is, respectively, High and Low. When the
parametric equalizer is first set, the high- and low-frequency roll-off filters are set for a flat response.
In order to change either filter, drag the square. The software will not permit the high- and
low-frequency shelf/rolloff filters to cross.
Shelf —
The Shelf filters can be adjusted from +6 dB to –18 dB in 0.5 dB increments. Shelving is
extremely useful for boosting flat frequency response, tempering very sibilant vocal microphones, or
enhancing the sound of off-axis lavalier microphones. The illustration below shows how shelving
filters can be used to boost or cut certain frequencies in a sound system.
Rolloff —
There is an additional step below –18 dB which sets the gain of the shelf to cut. When
the filters reach cut, they change from shelf filters to rolloff filters. When in rolloff mode, the GAIN field
turns into the SLOPE field, and clicking on the ↑ and ↓ buttons will adjust the slope of the rolloff. The
slope can be adjusted from 6 dB/octave to 24 dB/octave in 6 dB/octave steps. Please note that these
slopes are nominal values, so slopes at high frequencies will be more steep than those at low
frequencies. Rolloff filters are ideally used for attenuating the audio signal where extraneous noise,
excessive proximity effect, or other unwanted noise is present. The illustration below shows a
response curve with high- and low-frequency rolloff filters.
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