GEQ is an abbreviation for Graphic Equalizer, which is an audio signal processing equipment used to adjust the balance between different frequency components of an audio signal. Synonyms for GEQ include graphic EQ, equalizer, EQ, tone control, frequency shaper, audio filter, sound equalizer and audio equalizer. All of these terms refer to audio equipment or software that allows users to modify the frequency content of an audio signal to achieve a desired sound. GEQs are commonly used in live sound reinforcement, recording studios, and home audio systems to help achieve a better balance and clarity in the audio signal.