Back before the internet, twitter and megaphones it was a great deal more difficult to get your voice heard. However, those clever Greeks and Romans had a way of using the science of acoustics to get their message out.
They constructed great amphitheatres which seated thousands. An example of which is the image below I took when exploring an ancient Roman site in rural Turkey.
Scientists have continued to do research the way the acoustics worked to propel the voice of those ‘on stage’. A study by K. Chourmouziadou & J. Kang, published in the Journal of Applied Acoustics showed that amphitheatres evolved and changes in materials as well as design resulted in acoustic improvements. They simulated 6 different theatre types: Minoan, Pre-Aeschylean, Early Classic, Classic, Hellenistic and Roman. Each of these had different characteristics (figure 1)
The researchers then used acoustic simulation software to examine the theaters. They monitored the absorption and scattering conditions in each incarnation of the theatre. Their results indicated that there was increased reverberation time as the theatres evolved (figure 2) and the speech transmission increased in occupied theatres. They concluded that overall the evolution of the theatres brought about an improved listening experience.
CHOURMOUZIADOU, K., & KANG, J. (2008). Acoustic evolution of ancient Greek and Roman theatres Applied Acoustics, 69 (6), 514-529 DOI: 10.1016/j.apacoust.2006.12.009