Source Audio Spectrum Intelligent Filter User Manual page 29

A notch, a peak, and then a Low-Pass without any resonant peak. (The name implies they are in a
different order, but that is an error.) The notch is fixed at wide, and ignores the Q control. Q
controls the width of the peak. There will be a little phasery-ness to any response with a notch in it.
Notch, Notch, Low Pass
Two notches and then a Low-Pass.
Peak, Notch, Low Pass
A peak, followed by a notch, and then a Low-Pass. If a peak is present in a filter, and if Q is set to the
minimum, the peak becomes so wide that it tends to wash out any other structure, and will sound
less interesting.
SA248 Spectrum Intelligent Filter User Guide 29