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A Wide-Dynamic-Range Program Equalizer

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An extremely flexible yet easily settable equalizing system combines the advantages of four shelf response controls within the audio range and two peaking controls above and below. A dynamic range of 120 dB is achieved at flat settings through the use of a combination of discrete and integrated circuit low-noise operational amplifiers, all operated at near unity gain.

JAES Volume 23 Issue 9 pp. 722-726; November 1975
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