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LCD PL
ATE AMPLIFIER
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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.
Figure 19.
Low-pass Filter adjustment.
LOWPASS FILTER
> Back
Bypass: OFF
Freq: 120 Hz
Type: LR 24dB/Oct
The selection of the parameters is performed as explained for the
Highpass Filter
, and the options are:
-
Bypass
: On or Off.
-
Freq
.: with 1 Hz steps, defines the cut-off frequency (-3 dB). The range available is from 80 Hz to 200 Hz.
-
Type
: - Butterworth filters: BW 6 - 48 dB/Oct.
- Linkwitz-Riley filters: LR 12, 24, 36 or 48 dB/Oct.
DSP Settings > Directivity
Turning the control knob in the
Directivity
menu, allows to select different directivity options, to modify
the radiation of the subwoofers. 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 distance it must be 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 20.
Example of an end-fire setup in the Directivity menu.
Find more about subwoofer arrays in the
Applications
section.
DSP SETTINGS > PHASE INVERSION
PHASE INVERSION
Back
> Normal
+
Inverted
Figure 21.
Phase Inversion menu.
The
Phase Inversion
submenu switches the phase of the signal. In other words, it allows to invert or
"
reverse
" its polarity. Two settings are available:
-
Normal
: In phase setting.
-
Inverted
: The phase/polarity is inverted by introducing a 180° phase shift for all frequencies.
DSP SETTINGS > EQUALIZERS (EQ1 TO EQ5)
For system tuning purposes, 5 user-adjustable equalizers are available with the following parameters:
-
Bypass
: On (the EQ is bypassed) or Off (the EQ is active).
-
Type
: Low Shelf, Parametric or High Shelf.
-
Gain
: -12 to 12 dB, with 0.1 dB steps.
-
Freq
: 20 Hz to 1kHz, 1 Hz steps. Sets the center frequency for Parametric filters, or the edge frequency
for Shelf filters.
-
Slope
: 0.5 to 2, with steps of 0.1. Only for Shelf filters.
-
Quality
: 0.01 to 16 with steps of 0.01, where higher Quality Factor values mean narrower bandwidth.
Only for Parametric filters.
An example of a parametric equalizer with EQ1 in parametric mode is shown below.
Figure 22.
Equalizer menu.
EQ1
Back
Bypass: ON
Type: Parametric
> Gain: 6 dB
Freq: 60 Hz
Quality: 1.00
To modify equalizer parameters, follow the same steps detailed in the
Lowpass Filter
section. Notice that
the equalizers can be individually bypassed, their default setting.
