Hello how may I help you? I want to know what the loudest recorded sound ever was? I will gather that info right away. Perfect, thank you. The sound made from the Krakatoa volcano eruption in 1883. How loud was it? Loud enough to rupture ear drums of people 40 miles away. How was it recorded? I am not sure of the exact methods but the resulting blast traveled around the world 4 times and could be heard 3,000 miles away. Cool, thank you. Youre welcome, would you like to know more?