Parametric equalizers are capable of making much more precise adjustments to sound than other equalizers.
The amplitude of each band can be controlled, and the centre frequency can be shifted, and bandwidth (which is inversely related to “Q”) can be widened or narrowed. Parametric equalizers are multi-band variable equalizers which allow users to control the three primary parameters: amplitude, centre frequency and bandwidth. That year saw the rise of a parametric equalizer in the live music scene and studio. The following year (1972) George Massenburg, who was still a teenager, wrote a paper to AES in Los Angeles concerning parametric EQ and its use in music production. As the name suggested, this equalizer could make an arbitrary selection of frequency and gain in three overlapping audio bands. In 1971, Daniel Flickinger invented a tunable equalizer called ‘ Sweepable EQ’. Graphic equalizers were pretty famous until that point but people wanted to break out of this fixed frequency constraint. Until 1970’s if any kind of Equalizer existed it had fixed centre frequencies. 1950’s saw the growth of equalizers as an audio production tool.
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