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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
Type
Table 13. High/Low Pass Parameters
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.
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.
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