Parametric Eq - Ecler DPM3003 Notice D'emploi

5.10.5. PARAMETRIC EQ

This section groups ten parametric filters in serial mode
for each DPM3003 channel. This is very useful to precisely
shape the frequency response.
The upper part contains ON/OFF, FILTER TYPE,
FREQUENCY, GAIN and Q parameters. These parameters
always refer to one of these 10 filters, displayed as CURRENT
FILTER.
 Parametric equalizer ON/OFF parameter affects all
filters from this section. With OFF (unlighted button), no
filter acts (all are bypassed). With ON, operation is
determined by other parameters.
 FILTER TYPE selects the used filter type. The following
filter types are available:
 Bypass: no filtering is done.
 Parametric EQ (FREQUENCY, GAIN, Q): is a typical full parametric equalizer filter with
settings for central frequency (between 20Hz and 20kHz), gain or attenuation at central
frequency (between +12dB and -60dB) and bandwidth (1/Q, Q between 0.3 and 200).
 Low-Shelf and High-Shelf with 6 and 12dB/oct roll-off (FREQUENCY, GAIN): typical
Low-Shelf and High-Shelf filters with settings for cut-off frequency (between 20Hz and 20kHz)
and gain or attenuation (between +12dB and –60dB).
 Low-Pass and High-Pass with 6 and 12dB/oct roll-off (FREQUENCY): these are low-pass and
high-pass filters with variable cut-off frequency (between 20Hz and 20kHz).
 All-Pass order 1 and 2 (FREQUENCY, Q order 2): all-pass filters not affecting the signal
amplitude but the phase of some frequencies (on the other hand, a delay modifies phase for
all frequencies). Main application for this type of filter is phase error compensation in
speakers or errors with different causes e.g. phase change generated by a crossover.
In the above list, parameters shown within brackets are available for this filter type. Other
parameters are deactivated and can't be edited.
 FREQUENCY is made of a potentiometer and a linked numerical value allowing setting the filter
cut-off frequency (or central frequency, depending on the filter type).
 GAIN is also made of a potentiometer and a linked numerical value to set gain or attenuation for
filters if this parameter is applicable.
 Q (filter form factor) is made of a potentiometer and a linked numerical value allowing to set filters
band width value (1/Q) if this parameter is applicable.
The lower part of this section contains a ten-row list, one for each of the ten available parametric
equalization filters. Each row displays information about the relative filter, as filter type, frequency, gain
and Q (if applicable).
Only five of the available filters are displayed at the same time. To display the other ones, use the
vertical sliding bar on the right side of the list.
Click on a row to select the corresponding filter and upper controls (FILTER TYPE,
FREQUENCY, GAIN, Q) will be updated to reflect current filter values (including its number in
CURRENT FILTER). The selected row is displayed with a greater intensity and is highlighted with a
flashing frame cursor.
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