希臘半圓劇場的聲學秘密

https://www.livescience.com/7269-mystery-greek-amphitheater-amazing-sound-finally-solved.html?utm_content=buffer9e4ce&utm_medium=social&utm_source=facebook.com&utm_campaign=buffer

說是因為座位的石材會吸收500Hz以下，這就讓人聲（500Hz以上為主）凸顯。