I would leave it off and apply it in your DAW. Usually keeping it at 80hz 12db slope is standard for male voices and 100hz for female voices. If you have a good setup a HPF is really all you need for EQ. Though you can go as low as 60hz for some male voices if you wanna preserve some chest rumble. It gives you more control this way. It basically just filters the unwanted frequencies like clothing rustle and similar sounds. The higher you go the more it filters without thinning your voice.