The study of audio technology has a lot of fascinating branches, and one or two of them even take the curious engineer not into electronics but into architecture. There’s the anechoic chamber with its complete lack of echo, but at the other end of the scale, there’s the echo chamber.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/03/17/the-most-famous-room-in-rock-n-roll-youve-never-seen/