Gabriel and Bruno asked me to solve the problem of the acoustics in the main room of the Galpon Theatre.
The problem was that the speech transmission index (STI) was too low, due to an high reverberation time (RT, EDT, T30), about 2.5 sec.
This meant that actors could not be understood well by the audience.
Also, musicians made a great effort to hear themselves, because there were no strong early reflections.
By positioning the slanted panels at the top of the wall and hanging horizontal panels from the ceiling, it was possible to increase the sound energy directed towards the audience and the musicians, resulting in improved sound distribution. In this way, the reverberation time does not vary significantly, but what does vary is the temporal distribution of the sound energy.