EQ (Equalizer)
Definition
A tool for adjusting the level of specific frequency ranges within an audio signal. Used to correct tonal imbalances, remove problematic resonances, or shape the character of a sound.
In Simple Terms
The tone knob for each sound in your mix. Need more brightness? Boost the highs. Too muddy? Cut the lows. EQ lets you shape every instrument so they all fit together without fighting.
In Practice
A high-pass filter at 80 Hz removes low-frequency rumble from a vocal recording without affecting the voice itself. A gentle 2 dB boost at 10 kHz adds air and presence.