Definitions for "Butterworth"
A type of crossover circuit utilising low-pass filter design characterised by having a flat amplitude response, i.e., no amplitude ripple in the passband.
A CPC filter type with a Q = 0.707 producing a flat power response and a -3 dB crossover point.
A filter with a pass band allowing no ripple, but sacrifices steepness in the attenuation slope.