Ecler AmicLab - Manual (Page 20)

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5.10.6. PARAMETRIC EQ
This section groups ten parametric filters in
serial mode for each .amic 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 used filter type. Following
filter types are available.
Bypass means no filtering is done.
Parametric EQ (FREQUENCY, GAIN, Q) is a typical parametric equalizer filter with
settings for central frequency (between 20Hz and 20kHz), gain or attenuation at central frequency
(between +12dB and -60dB) and band width (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) 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) are 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.
Parameters 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 to set 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 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). Selected row is displayed with a greater intensity and is highlighted with a flashing
frame cursor.