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A number of objective measures are commonly used for an indication of subjective response to vehicle interior noise, including dBA, Loudness, Speech Interference Levels (SIL). Intelligibility etc.. Additional measures have been developed from a combination of specific orthogonal objective parameters with the aim of further improving the correlation with subjective response. For example, the Composite Rating of Preference (CRP) Index has been found to consistently improve the correlation upon dBA, through the inclusion of a spectral balance, and high frequency component However the ability of any objective parameter or index to provide a good correlation will be limited by any non-linearity present in the subject response, typically occurring through saturation of one or more aspect of the vehicle noise. This is further frustrated through subject inconsistencies and disagreements.