Fix a common audio issue (low end noise) with a flick of a switch.
Most audio recorders and some microphones have a low cut or high pass filter (they’re the same thing). Turning this switch on will cut out some of the lowest frequencies. Each recorder or microphone is different but most commonly this switch will remove up to 80 to 100Hz.
A common audio issue I hear in videos, is low end rumble or hiss produced by heating and air conditioning units indoors or traffic outside.
If you are hearing that in your audio (it takes some time to learn how to identify it) then using a low cut filter is one way to possibly reduce or eliminate the problem.
If you don’t have a low cut filter on your recorder or microphone, all is not lost. You can apply this filter with any EQ in even the most basic of audio and video editing software.
As a general rule, it’s good to apply a low end cut in your EQ or audio post production up to about 80Hz when processing your audio for voice.
Human voice doesn’t touch the band of frequencies lower than 80Hz so the result is that you remove unwanted sounds that don’t contain the stuff you do want…your voice. Where exactly you set your low cut filter will differ for each person. With a female voice, you will notice that you can cut more of the low end before affecting the voice.
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