Tips for Sound Engineers - High Pass Filters HPF

To help 'clean up' your live sound mix, increase clarity and do away with unwanted spurious low end / bass noise through vocal microphones and many instrument microphones, the first port of call is to use the high pass filter.

Nearly every audio console has a high pass filter (HPF) function of some sort on input channels, be it a fixed frequency switch or a selectable band via a pot.

Given that most vocals in the context of an overall mix sound quite natural even when you apply the high pass from 160-180Hz or males & 160-200Hz for females, it's a great tool to instantly remove the cumulative effect of lots of low end rumble from multiple input sources.

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