A filter is the simplest form of EQ section possessing only the parameters of cut-off frequency and slope.
The cut-off frequency is the frequency at which the response has already dropped by -3 dB.
The slope is the rate at which the level drops above the cut-off frequency, measured in dB/octave. It is easy to design filters with slopes of 6, 12, 18 and 24 dB/octave.
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