A graphic equalizer is a high-fidelity audio control that allows the user to see graphically and
control individually a number of different frequency bands in a stereophonic system. A typical
graphic equalizer consists of several audio filter/amplifiers, each centered at a specific
frequency in the audio range. Most graphic equalizers have two identical sets of filter/amplifiers,
one for each channel in a stereophonic system.
The gain (volume) controls in most graphic equalizers are slide potentiometers that are adjusted
by moving a control button up or down. Gain is increased by sliding the button upwards. The slide
potentiometers for each channel are placed side-by-side, with the lowest-frequency unit at the left
and the highest-frequency unit at the right. In this way, the positions of the buttons appear to
follow a graphical curve that represents the gain as a function of frequency for each channel.
Graphic equalizers are common in middle- and high-end stereophonic sound systems for consumer
use. They are found in practically all professional recording studios. Graphic equalizer programs
are also available for use in fine-tuning sound in a personal computer.
This was last updated in June 2007
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