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Table 11. High Pass/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 hand held microphones are used.
Frequency
Set the cutoff frequency. You can adjust the frequencies 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)
The dB per octave refers to how steep the roll off of the fil
-
ter is below the selected cutoff frequency.
