QSC's blog "How to Create A Clear and Present Mix Using Your EQ Tools (Part 2)" has been translated and posted. In this blog, she explains how different frequency bands sound, the "fundamental frequency range" is, the range of sounds each instrument can make, and how to establish a good signal-to-noise ratio to understand equalization better. Please check it out.
How to Create A Clear and Present Mix Using Your EQ Tools (Part 2)