Crest Audio X-VCA Owner's Manual page 15

high-pass filter—HPF
Proper use of the high-pass filter reduces or eliminates unwanted low frequencies
without substantially affecting the program material. Quite often such unwanted
low frequencies are included with in-coming mic- or line-input signals. For exam-
ple, stage rumble or wind can be picked up through vocal mics.The slope of the
high-pass filter is 12dB per octave.
HPF
High-pass filter is on.
HPF—variable control
When the high-pass filter is on, this control selects a frequency between
20Hz and 400Hz as the point where attenuation begins.
mono input module
Many microphones
have a built-in switch-
able high-pass filter.
1
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p. 15