The ear doesn’t hear frequency in a linear arithmetic way, but logarithmically. So the halfway point between 100 Hz and 1600 Hz isn’t 850 Hz as you might expect. This video shows how and why, and finds out the halfway point of the full frequency range of human hearing.
Layout, Signal Flow & I/O
This high level audio course is essential knowledge for anyone who wants to learn how analog consoles and their state of the art studios are "wired up." It gives you the deepest possible understanding of mixing console Signal Flow and I/O both analog & digital.