ACHAT DSP24 • OWNER’S MANUAL
14
The following is an example screen for the “Delay” page where
the delay time of input channel A is set to 160.1872 ms:
EQ: [x] sub-menu
– from this sub-menu it is possible to set five
available parametric or shelving filters for the input channels.
The DSP24 allows the user to select either bell or shelving
Parameters and assign them independently using the 5
available filters.
In order to select the filter type, it is necessary to have the
filters GAIN=0.0dB. Then using the PM2 encoder, rotate it
“clockwise” in order to set the bell filters bandwidth, or rotate
it “counter-clockwise” to select the shelving filter type (low or
high) and its order (1
st
or 2
nd
).
So, in order to define the filter type for the filter number 1
(“x”=1), it is necessary from the above screen, to enter the
filters editing page pressing the ENTER button, and the screen
has to appear as follows:
In this case, the filters GAIN=0.0dB, and being BW=1.05, the
current filter selected is a bell type now. Rotating the PM2
encoder clockwise, the parameter BW will range from 0.05 up
to 3 for identifying a bandwidth value for a bell filter.
If a bell filter is selected, then the gain can be modified from
0.0dB and the BW will range between 0.05 and 3.
If the user wants to select a shelving filter from the above
setting, with the GAIN=0.0dB [if the GAIN is not 0.0dB, it is
necessary to set it at 0.0dB using the PM3 encoder], rotate
the PM2 counter-clockwise. Once BW reaches the 0.05 value,
at the next step of the PM2 counter-clockwise rotation, the
selection of the shelving filters will be entered.
Still rotating the PM2 counter-clockwise, the shelving filters
and their order will be selectable in the following sequence:
1. 1
st
order Low Shelving =
–
6LoSh [on the screen]
2. 2
nd
order Low Shelving =
–
12LoSh [on the screen]
3. 1
st
order High Shelving =
–
6HiSh [on the screen]
4. 2
nd
order High Shelving =
–
12HiSh [on the screen]
Once the desired shelving filter is selected, the PM3 can then
be used to select the desired GAIN and when the GAIN is set
at a value different from 0.0dB, then the filter type cannot be
changed until this GAIN is returned to 0.0dB.
BELL Filter:
As an example, if you want to set a bell filter
within EQ-1, then the BW has to be set at a desired value of
say 1.00 using the PM2 encoder, the GAIN at say +3dB using
the PM3 encoder and the centre frequency at say 1.00kHz with
the NAV/PM1 encoder.
The EQ sub-menu screen will show the following:
Once in the bell filters edit screen all the filters parameters can
be modified using the “NAV/PM1”, “PM2” and “PM3” encoders
for editing the filters centre frequency, bandwidth BW and gain.
The centre frequency of the parametric filter can be edited
using the “NAV/PM1” encoder, the BW the “PM2” encoder and
the gain the “PM3” encoder:
