This paper presents analysis and design equations for a new and unique equalizer section called a constant-S equalizer. The uniqueness of this variable equalizer section is that as equalization is varied from step to step the apparent level of the program being equalized is constant. No compensating attenuators are employed. With conventional equalizers, as equalization is varied from step to step, the point of maximum equalization remains constant the insertion loss of unequalized frequencies changes. With the constant-S equalizer, as equalization is varied from step to step, the point of maximum equalization changes and the insertion loss of unequalized frequencies remains constant.
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