A person recently asked me what I meant by the term business system.. I thought others might like to know a definition that works for me. A system is a procedure, process, method, or course of action designed to achieve a specific result.
The voiced speech of a typical adult male will have a fundamental frequency from 85 to 180 Hz, and that of a typical adult female from 165 to 255 Hz. Thus, the fundamental frequency of most speech falls below the bottom of the voice frequency band as defined above.
Unless you're recording a rich baritone or deep bass voice, it's safe to start with a cutoff frequency of 70-100Hz. If you hear too much low end missing, just lower the cutoff point till you find a happy medium that minimizes the plosives and keeps the sound intact.