FBT DLM26 - Manual (Page 36)

LPF sub-menu – from this sub-menu it is possible to set the Output Channels Low Pass Filter.
Once on the LPF page
Pressing the ENTER Button, the filter type fields and the Cutting frequency fields, become
accessible for the filter's type selection and the Cutting Frequency “fine” setting
The available shapes and orders for the Low Pass Filter, that are accessible by rotating the
“Param.2” encoder, are listed below:
− Bypass (Low Pass Filter Bypassed)
− Buttw_1st (Butterworth Filter 6dB/Oct Slope)
− Buttw_2nd (Butterworth Filter 12dB/Oct Slope)
− LRiley_2nd (Linkwitz/Riley Filter 12dB/Oct Slope)
− Bessel_2nd (Bessel Filter 12dB/Oct Slope)
− Buttw_3rd (Butterworth Filter 18dB/Oct Slope)
− Buttw_4th (Butterworth Filter 24dB/Oct Slope)
− LRiley_4th (Linkwitz/Riley Filter 24dB/Oct Slope)
− Bessel_4th (Bessel Filter 24dB/Oct Slope)
− Custom_2nd (IInd Order Filter Cell with editable Cutting Frequency and Q)
− Custom_3rd (Cascade of 2 IInd Order Filter Cells with editable Cutting Frequency on both and Q on the
second one)
− Custom_4th (Cascade of 2 IInd Order Filter Cells with editable Cutting Frequency and Q on both of them)
LPF sub-menu [Standard Filters]– from the sub-menu page, using the Param.2 encoder, it is
possible to set the LPF in Bypass or as one of the 8 Standard Filters: Buttw_1st, Buttw_2nd,
LRiley_2nd, Bessel_2nd, Buttw_3rd, Buttw_4th, LRiley_4th, Bessel_4th.
The following is an example of a LPF sub-menu screen with the filter set at 400Hz as 24dB
Linkwitz/Riley on Output1... using the name “Low” (see later for assigning a Name to the
outputs):
The filter's Frequency can be set already within this editing page using the Param.3 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.
Out-1 Low LPF
->LRiley_4th F = 400Hz
Out-1 Low LPF
Bypass F = 12500Hz
Out-1 Low LPF
->Bypass F = 12500Hz
Out-1 Low LPF
->Edit Freq = 400Hz