Filter Response

The amplitude gain and phase shift characteristics of a linear filter as a function of frequency. The response of a filter is designated by specifying the frequencies at which the amplitude is down by 3dB and by the slope of the cutoff. Thus, 14/18-56/36 specifies a low-cut filter down by 3dB at 14 Hz with an 18dB/ octave slope and a high-cut filter down 3dB at 56 Hz with a 36 dB/octave slope.