HELIX DN9848E Remote Control Software
User Guide
47
5.3.5 High Pass and Low Pass Filters (Filters Screen)
The HELIX DN9848E provides the following high pass and low pass filter (HPF and LPF) options for
crossover purposes:
• Bypass: No Filter
• Butterworth: 6, 12, 18, 24, 36 and 48dB/Octave
• Linkwitz-Riley: 12 and 24dB/Octave
• Bessel: 12, 18, 24, 36 and 48dB/Octave
• Peaking 12dB (HPF only): 12dB/Octave 0-6dB Gain
• Peaking 24dB (HPF only): 24dB/Octave 0-6dB Gain
To add a high pass filter to output processing
1 In the Phase Shift section of the Filters screen, select HPF from the
Reference drop down list.
2 In the High Pass section (see diagram right), adjust the Frequency
control knob or click and drag the target on the graph to select a
frequency of between 20.0 Hz and 15.00 kHz.
3 In the Type drop down list, select one of the filter options, for
example, “Peaking 12dB”.
4 Adjust the Slope/Peak Gain control knob (switches between slope and
gain, dependent on filter type) to select a slope/peak gain dB value
(range varies depending on type selected). At this point, you can
use the target on the graph to adjust both the frequency and
slope/peak gain simultaneously.
To add a low pass filter to output processing
1 In the Phase Shift section of the Filters screen, select LPF from the
Reference drop down list.
2 In the Low Pass section (see diagram right), adjust the Frequency
control knob or click and drag the target on the graph to select a
frequency between 50.0 Hz and 20.0 kHz.
3 In the Type drop down list, select one of the filter options, for
example, “Bessel”.
4 Adjust the Slope control knob to select a dB value (range varies
depending on type selected).
To bypass the high/low pass filter processing
1 In the Phase Shift section of the Filters screen, select LPF or HPF, as required, from the
Reference drop down list.
2 Select Bypass in the Type drop down list of the High Pass or Low Pass section, as appropriate.
The last selected values for each type of filter are retained in the background for easy
recall.