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Practical Loudness: An Active Circuit Design Approach

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A loudness control fully compensated at mid and low frequencies has been designed for home use which can be aligned to match equal-loudness contours over about a 40-dB attenuation range. Using a linear potentiometer and an operational amplifier, the circuit can provide a smooth audio taper as well as a control of volume which is free of tonal balance coloration.

JAES Volume 24 Issue 1 pp. 32-35; February 1976
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AES - Audio Engineering Society