mi niDSP Ltd, Hong Kong /
/ Features and speci fi cations subject to change wi thout pri or noti ce
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3.4.3
Parametric EQ
Parametric equalization (PEQ) is a flexible type of equalization filter. It can be used to correct for errors in
loudspeaker output, to compensate for acoustic room effects, and to tailor the overall system response fo r best
sound. Click on the PEQ button to open the parametric equalizer settings window:
In the center of the window is a frequency response graph that illustrates the combined response of all enabled
parametric filters on that channel. The screenshot above shows a response curve created with a low-shelf boost
filter at 100 Hz, a dip at 500 Hz, and a high-shelf cut filter at 5000 Hz.
There are ten filters per channel, each of which is displayed by clicking on the buttons
EQ1
,
EQ2
, and so on. Each
filter can be set to one of four types:
PEAK
Create a dip or a peak in the frequency response.
LOW_SHELF
Reduce or increase part of the frequency spectrum
below
a given frequency.
HIGH_SHELF
Reduce or increase part of the frequency spectrum
above
a given frequency.
SUB_EQ
Create a dip or a peak in the frequency response at low frequencies (10 to 50 Hz). This filter type
is similar to PEAK but gives more accurate results for low frequencies. Note that activating any
SUB_EQ filter reduces the number of available filters on that channel from ten to nine.
Each filter has three parameters that control its location and shape. These parameters can be entered directly as
numerical values, or by using the sliders:
Frequency
For the PEAK and SUB_EQ filter types, this is the center frequency of the peak or dip. For the
HIGH_SHELF and LOW_SHELF filter types, this is the frequency at which the gain is half of the set
value.
Gain
For the PEAK and SUB_EQ filter types, this is the gain in dB at the center frequency. For the
HIGH_SHELF and LOW_SHELF filter types, this is the gain in dB reached at high or low
frequencies respectively.
