The sound colour reproduction properties of wavefield synthesis are analysed by listening tests and compared with that of stereophony. A novel technique, "OPSI", designed to avoid spatial aliasing is presented and analysed in theory and practice. Both stereophonic phantom sources as well as OPSI sources were perceived to be less coloured than was predicted by colouration predictors based on the spectral alterations of the ear signals. This leads to the hypothesis that a decolouration process exists for stereophonic reproduction as proposed in the "association model" of Theile.
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