The frequency identified by the numbers above each slider of a graphic equalizer is the center frequency. The center frequency is the specific frequency that each slider controls, allowing the user to boost or cut the amplitude of that frequency and those in its immediate vicinity. This helps in fine-tuning the audio signal to achieve the desired sound quality.
[Reference: Audio equipment manuals and equalizer usage guidelines, such as those from Axis Communications and other audio equipment manufacturers, explain the function of center frequencies in graphic equalizers., ]
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