We all know why we use High Pass Filters. Setting the HPF at a correct frequency can help build clarity in your mix by getting rid of low end “mud”
If you are ever running front of house, here is a quick tip if you are waiting around for soundcheck. Set your HPF’s ahead of time! You have to already have your input list ready, channels named, and an understanding of what the inputs frequency response is like.
For example, we know that the low E string of a guitar is 80Hz so a good starting point could be to set the HPF at 80Hz! If you are running sound for a full band, you could set it to a higher frequency. For singer songwriters, I would leave it no more than 80 because you don’t have any other inputs to take up the spectrum.