Progettazione di una conchiglia acustica per il coro del Politecnico. The purpose of the thesis is to lay the foundations for the design of an acoustic shell for the choir of Polytechnic. I focused on the study of the Self-To-Other-Ratio parameter. With four pair of binaural microphones it was possible to perform parameter measurements for four choristers (one per section) both indoors and outdoors (clarification in the internal courtyard of the Polytechnic and in the Aula Magna). The parameter was measured in four configurations asking the singers to change their position. Consequently, with the help of a script in matlab I analyzed the data and thanks to the questionnaires I could find out which configuration reported the optimal value.