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Low-Pass (High Cut)
This feature helps eliminate high-frequency noise (signals of 8000 Hz and above) such
as background hiss and sibilance (excessive "S" in vocals, etc.) and is used primarily
with microphone-level input. It is particularly effective when handheld microphones
are used.
Frequency
Type
Limiter
A limiter is a compressor with a high slope (i.e., attack) that is used to prevent a signal
from exceeding a set decibel level. Limiters are used as safeguards against signal clipping.
Limiter parameters are set per channel.
Table 13. High/Low Pass Parameters
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 low-pass filter attenuates content above this fre-
quency and lets frequencies below 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 above the selected cutoff frequency are attenu-
ated. For example, if the cutoff frequency is 8,000 Hz and
the filter type specifies 12 dB per octave, a 16,000-Hz sig-
nal (i.e., one octave higher) will be attenuated by 12 dB and
a 32,000-Hz signal (i.e., two octaves higher) will be attenu-
ated by an additional 12 dB.
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