Decide which frequency range to adjust. Low-frequency adjustments affect the “boominess” of the sound of bass notes, like those of kick drums and bass guitars. Mid-frequency adjustments affect the “brightness” of the sounds of guitars and vocals. High-frequency adjustments affect the “sparkle” or crispness of high notes, such as those produced by cymbals and piercing guitar solos.
Adjust the frequency control to target a particular frequency inside the low, mid or high range. Low numbers affect low frequencies. High numbers affect high frequencies. The exact steps to do this vary among the types and brands of audio equalizers. Some allow you to turn a knob to set the center frequency and then boost or lower it, while others allow you to move a slider that corresponds to one particular frequency.
Adjust the “Q” control to increase or decrease the frequency bandwidth (if your audio equalizer offers this option). A wide-frequency bandwidth (a low “Q” setting) will affect a wide range of frequencies near the center frequency. A narrow bandwidth (a high “Q” setting) will affect only the frequencies close to the center frequency. Experiment with the "Q" setting to find out what works for you.
Test different settings to find your preferred sound. The only way to find an equalizer setting that matches your taste is to keep tweaking the sound. In general, if you want to add “oomph,” focus on the low- to mid-range frequencies. To add sparkle and crispness, focus on the mid- to high-range frequencies.