FBT DLM26 - Manual (Page 37)

LPF sub-menu [Custom Filters]– from the sub-menu page, using the Param.2 encoder, it is
also possible to set the LPF as “Custom Filter”, where this means that the LPF is builded as
cascade of IInd Order Cells, which number is depending from the filter's order and where for each
Cell can be set independently the High Cut frequency and the Q.
More precisely, the available independent parameters for setting are the following:
1. Custom_2nd: builded using 1 IInd order Cell, where High Cut Frequency and Q can be set
2. Custom_3rd: builded using 2 IInd order Cell, where High Cut Frequency can be set on both
the cascaded Cells and the Q on the second one
3. Custom_4th: builded using 2 IInd order Cell, where High Cut Frequency and the Q be set
on both the cascaded Cells.
The following is an example of a LPF sub-menu screen with the filter set at 400Hz as Custom_4th
on Output1... using the name “Low” (see later for assigning a Name to the outputs):
From this Page, to access the cascaded IInd order Cells, it is necessary to rotate the NAV/Param.1
encoder Clockwise or Counterclockwise.
The number of accessible IInd order Cells is depending from the Custom Filter order: Custom_2nd
will allow the editing of just one IInd order Cell, Custom_3rd and Custom_4th, the access to 2
IInd order Cells.
In the previous example, rotating Clockwise the NAV/Param.1 encoder, we can access the Filt1
(Cell1) and Filt2 (Cell2) pages, for the Cells High Cut Frequency and Q settings.
When within the Filt1 editing Page, in example:
And we can chose a different setting within the Filt2 page:
The filter's Frequency can be set already within these editing pages using the Param.2 encoder,
but here is for Frequency “fine tuning” being the Frequency increment/decrement done by 1Hz
steps.
For a quick High Cut Frequency setting, need to press the ENTER Button for accessing the High
Cut Frequency Fast Setting Page.
“High Cut Frequency”: the selectable frequencies range is from 20Hz to 20kHz.
Here, the NAV/Param.1” encoder will increment/decrement the Frequency value by step of one
thousand Hz, the Param.2 by steps of one hundred Hz and the Param.3 by steps of one Hz.
Note1: once the desired options have been selected using the 2 encoders, they are automatically
saved as current and stored in the DLM26 system status once leaving the page.
Note2: to exit this page, push the “ESC” button.
Out-1 Low LPF
->Custom_4th F = 400Hz
Out-1 Low LPF
->Edit Freq = 400Hz
Out-1 Low LPF
->Filt1 F = 400Hz Q = 0.7
Out-1 Low LPF
->Filt2 F = 400Hz Q = 1.5