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LCD PL
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DSP SETTINGS > HIGHPASS FILTER
The Highpass Filter section allows to change cut-off frequency of the high-pass protection filter. The lowest
possible setting is an electrical 4
th
order, tuned for
S 112i PRO
at 36 Hz. This filter is always enabled.
All frequency steps above the lowest option correspond to an acoustical 6th order Butterworth filter.
These additional values are: 48, 50, 53, 56, 60, 63, 67, 71, 75, 80, 85, 90, 95 and 100 Hz.
Changing this cut-off frequency can be useful mainly when the
S 112i PRO
subwoofer is used with other
subwoofers that cover the lower frequency bands. To do this:
1. Set the cursor „
>
“ on the option „
Freq
“ and click the encoder. The „
*
“ symbol appears to indicate
that edition is enabled.
2. Turn the controller to choose the value desired and fix it by pressing the button.
3. Choose „
Back
“ and click the rotary controller to return to the DSP Settings submenu.
HIGHPASS FILTER
> Back
Freq. : 36 Hz
Figure 25.
High-pass Filter adjustment.
DSP SETTINGS > LOWPASS FILTER
The DSP of the subwoofer also includes an adjustable Lowpass Filter and this submenu allows to change
its type, slope and cut-off frequency, and to bypass it.
LOWPASS FILTER
> Back
Bypass: OFF
Freq: 120 Hz
Type: LR 24dB/Oct
Figure 26.
Low-pass Filter adjustment.
The selection of the parameters is performed as explained for the Highpass Filter, and the options are:
-
Bypass: On or Off.
-
Freq.: sets cut-off frequency (-3 dB) from 80 to 240 Hz, with 1 Hz steps.
-
Type:
-
Butterworth filters: BW 6 - 48 dB/Oct.
-
Linkwitz-Riley filters: LR 12, 24, 36 or 48 dB/Oct
DSP SETTINGS > DIRECTIVITY (S 112i PRO ONLY)
Turning the control knob in the Directivity menu activates different directivity options in order to modify
the radiation of the
S 112i PRO
subwoofer. This function offers three options:
-
Normal: no process is applied and the subwoofer behaves as an omnidirectional source.
For this mode, no additional information is shown in the Active Preset Info screen.
-
Cardioid: it implements specific DSP processes to create a cardioid directivity pattern when used
properly in a subwoofer array. In this mode, the letters "
CA
" appear in the Active Preset Info screen.
-
End-Fire: it enables end-fire configuration by selecting a desired tuning frequency with the "
Att. Freq
"
parameter. This factor ranges from 40 Hz to 100 Hz, in 1 Hz steps.
By changing the attenuation frequency, the screen shows the necessary space between the front
grilles of the subwoofers to get the effect. Finally, when this mode is implemented, the Active Preset
Info screen shows the letters "
EF
".
DIRECTIVITY
Back
Type: End-Fire
> Att. Freq: 69 Hz
Sub Dist: 1.24 m
Figure 27.
Example of an end-fire setup in the Directivity menu.
Subwoofer arrays are able to control and aim the sound by introducing directivity in the
intended direction. The "Cardioid" and "End-Fire" configurations are two of the most common
setups.
The first one uses typically three subwoofers aligned or stacked: two of them facing front or
towards the audience, and the other facing rear or towards the stage.
End-Fire setups use two or more subwoofers placed behind each other with a fixed spacing and
- in some cases - different polarities. They provide very good rear-cancellation and are easy to
set up, but require more space to implement.
In both cases, a specific delay must be applied in order to achieve wave summation in the front,
and cancellation in the rear.
In cardioid setups, select "Normal" mode for subwoofers facing front, and "Cardioid" mode for
the one facing rear.
For end-fire configuration, select "End-Fire" mode for the first subwoofer and observe in the
screen, the distance calculated. Place the second subwoofer behind keeping that distance
between the grilles, and select "Normal" mode for the second subwoofer.
