The Explanation History of Loud Speaking and The Loud Speakers

Every time I attempt to go deep into the forest, I hear the warning chorus of monkeys and chimpanzees sitting on the tree tops. They might be doing this since some 30 million ago. At that time, the dry-nosed Haplorrhini were transforming themselves into the downward-nosed Catarrhini and Hominoidea family of gorillas, chimpanzees and humans. We can visualize the timeline of loud speaking and the loudspeakers.