Knowing what each band actually controls turns guesswork into a targeted fix — here's a frequency guide to what each of the four ranges does in practice.
60Hz (Low): bass weight and rumble — too much sounds boomy, too little sounds thin. 500Hz (Low-Mid): body and warmth — too much sounds boxy. 2.5kHz (High-Mid): presence and clarity — too much sounds harsh. 8kHz (High): air and sparkle — too much sounds sibilant or brittle.
When something sounds wrong, describe it in plain words first — boomy, boxy, harsh, dull — then match that word to the band above. That translation from description to frequency is the entire skill of using an equalizer well. For a full rundown of every control, not just the four bands, see Quad Equalizer Settings.