2.1.21. IIR contour type

IIR contour type changes the IIR filter contour of LUFS loudness measurements; peak and RMS measurements are unaffected. The following contours are supported:

K-weighting
ECMA-418
ITU-R 468
A-weighting
C-weighting

Contours other than K-weighting no longer conform to the LUFS standard, but are provided for flavor and perceptual precision.