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> One performance measure might be the attenuation one octave and two
> octaves from the 3dB cutoff frequency (more attenuation = higher
> score). That's a frequency domain measurement.
In the frequency domain, the -3 dB point is more or less irrelevant. A
2-pole filter will be 12 dB down an octave above Fc (Fc*2). How far down
it is at Fc will depend on the Q or the damping factor (1/2Q) of the
filter. Its behavior (overshoot, undershoot) in the time domain will be
determined by Q.
--
Dennis
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