How does sticking weirdly shaped foam blocks on the walls of a room make noise hard to hear from inside and out?

Question

How does sticking weirdly shaped foam blocks on the walls of a room make noise hard to hear from inside and out?

In: 13

Answer 1

Those are acoustic panels: https://resonics.co.uk/what-acoustic-panels-do/

https://www.soundonsound.com/sound-advice/beginners-guide-acoustic-treatment

Sound is vibrations. Those absorb sound and cause bounced vibrations to scatter. In a regular room if you make a loud sound, you’ll hear it reverberate. If you put up blankets and pillows and other soft materials on the wall (an inexpensive substitute) they absorb the sound.