In this case, the filter's 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. 1st Order Low Shelving = -6LoSh [on the screen]
2. 2nd Order Low Shelving = -12LoSh [on the screen]
3. 1st Order High Shelving = -6HiSh [on the screen]
4. 2nd 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 we 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 center Frequency at say 1.00KHz with the “NAV/PM1” encoder.
The EQ sub-menu screen will show the following:
Once in the Bell Filter's edit screen all the filter's parameters can be modified using the
“NAV/PM1”, “PM2” and “PM3” encoders for editing the Filter's Center Frequency, Bandwidth BW
and Gain.
The Center Frequency of the Parametric Filter can be edited using the “NAV/PM1” encoder, the BW
the “PM2” encoder and the Gain the “PM3” encoder:
“
Center Frequency
”: the selectable frequencies range is from 20Hz to 20kHz in steps of 1/24 of an
Octave and can be adjusted by rotating the “NAV/PM1” encoder.
“
Bandwidth BW
”: the selectable BW range is from 0.05 Octave to 3 Octave in steps of 0.05 Octave
and can be adjusted by rotating the “PM2” encoder.
“
Gain
”: the selectable Gain range is from -15dB to +15dB in steps of 0.5 dB and can be adjusted by
rotating the “PM3” encoder.
Low Shelving Filter:
As an example if we want to set a low shelving filter within EQ-1 then the
“PM2” encoder has to be rotated counter-clockwise until the desired Low Shelving filter say -6LoSh
appears on the screen, the GAIN at say +3.0dB using the “PM3” encoder and the High Cut
Frequency at say 1.00KHz with the “NAV/PM1” encoder.
The EQ sub-menu screen will show the following:
Input-A EQ-1
->1.00kHz BW=1.00 + 3.0dB
Input-A EQ-1
->1.00kHz -6LoSh + 3.0dB
17
