Microphones of similar construction and polar-pattern that can be equalized to have nearly identical on-axis frequency response still are reported to have different sonic character. To help develop a model of how other physical measurements could predict the subjective sonic character, perceptual data were collected from a panel of listeners. The listeners individually made dissimilarity ratings of pair-wise comparisons of 9 versions of a single piano performance. Each version was recorded with a different model of small-diaphragm cardioid condenser microphone. The data are used to derive a stimulus space showing the most salient dimensions upon which the perceived timbre of the microphones differed.
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