Quote:
Originally Posted by bezusheist
the "12db/oct" figure is measured from "0", not the cutoff's -3dB.
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Well, that didn't seem right to me. 12db/oct really does mean there should be 12db difference between any frequency and its double/half, but apparently different types of filters take longer to reach that "ultimate" slope, so basically you can't trust that first octave to tell you anything. If we looked another octave or two away, we'd be closer to the actual thing.
See here.