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To adjust the high/low pass parameters for a channel:
1
On the appliance Web UI’s main page, select
DSP
.
2
Select the
Menu
button for the channel.
3
From the drop-down menu, select
High/Low Pass
.
4
Set the parameters described in the following table:
Note:
If you want to return to the factory settings, select the
Reset
icon that appears in
the right corner.
Table 10. High/Low Pass Parameters
High-Pass (Low Cut)
This feature helps eliminate low-frequency noise (signals of 100 Hz and below, such as
background rumble from ventilation systems, etc.) and is used primarily with micro
-
phone-level input. It is particularly effective when handheld microphones are used.
Frequency
Set the cutoff frequency. You can adjust the frequency by
moving the knob (click and move up or down) or by dou
-
ble-clicking the knob and typing the frequency. When typ
-
ing the frequency, only numeric values from 20 Hz to
20,000 Hz can be entered.
The high-pass filter attenuates content below this fre
-
quency and lets frequencies above this cutoff frequency
pass through the filter.
Type
Available filter types are:
• Linkwitz-Riley (12, 24, 36, and 48 dB per octave)
• Butterworth (6, 12, 18, 24, 30, 36, 42, and 48 dB per
octave)
• Bessel (12, 18, and 24 dB per octave)
Note:
The term “dB per octave” describes how steeply fre
-
quencies below the selected cutoff frequency are attenu
-
ated. For example, if the cutoff frequency is 100 Hz and the
filter type specifies 12 dB per octave, a 50-Hz signal (i.e.,
one octave lower) will be attenuated by 12 dB and a 25-Hz
signal (i.e., two octaves lower) will be attenuated by an
additional 12 dB.
