What is EQ?
Every sound is made of frequencies. Frequency is measured with Hertz (Hz). Equalizing is the art of boosting, cutting and balancing all the frequencies in a mix to get the sound you want.
You’ll often hear the frequency spectrum described as the highs, mids and lows. Bass instruments have a very low-heavy, boomy sound. Their output is mostly low in the frequency spectrum. Alternately, a snare or a high-hat are often a lot more tinny, so they will typically appear in the mid or high frequencies.
Even though we can place these sounds in the general high and low categories, all sounds will have important information in both the highs and the lows.