# Translations:Feedback filters/4/en

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If the magnitude of *c* is less than 1 - that is, if - this box produces a constant attenuation. On the other hand, if the magnitude of *c* is greater than 1 - that is, if - this box produces a constant amplification. Because the input to the constant box is , the output from the constant box is (as shown at point *B* in Figure 12). The action of the constant box in terms of *Z*-transforms is