New (stage) parameter for conductor’s acoustics?

During fine-tuning of the stage acoustics of the main auditorium of Casa da Musica, designed by Office for Metropolitan Architecture, in Porto (Portugal) we were confronted with conflicting comments with respect to the acoustic effect of different canopy positions. The well known stage parameters, ST and CS, did not point out a difference in results for the different canopy positions, while the conductor's experience did. So we carried out several measurements and tried to find a parameter that could clarify the contradictory experiences of the musicians and the conductor. We needed a parameter that correlated with the 'transversely support over the stage ' instead of or additional to the known parameters. It was also not clear to what degree the commonly used parameters describe the acoustics at the conductor's position. This study aims at proposing a new (stage) parameter as well as trying to find out more about the 'conductor's acoustics'. In the main auditorium (CdM) the newly defined parameter seems to describe the musicians ' and conductor's experiences on the hearing 'ensemble ' on stage even better than the known stage parameters. The same measurements have been carried out in other halls in order to check the validity of this new parameter.