While Clean Cut Audio started off as a podcast production company, the bulk of my business lately has been coaching in the audio for podcasting space. The thing I see my students wanting help with the most is equalization. Presets have failed them and they know that in order to get their podcasting sounding how they hear it in their heads, they need to learn the art and the science of equalization.
This .pdf is the ultimate starting point for folks who are starting from zero when it comes to equalization. It explains what an equalizer does, the parts of a standard equalizer and what they do, characteristics of each frequency band of the human voice, common problem areas, common equalization moves, and common pitfalls.