the.com/reverb

sound refusing to die, bouncing off walls until it finally admits the room is empty

means The lingering persistence of sound caused by reflections bouncing around a space after the original noise has stopped — or the electronic effect that imitates it.

from A 20th-century clipping of "reverberation," which comes from Latin "reverberare," meaning to beat or strike back — built from "re-" (back) and "verberare" (to lash, to whip), related to "verber," a rod or lash. So buried in the word is the image of sound being flogged back at you off the walls.

physics
thousands of echoes blurred too fast to count
decay time
measured as RT60, seconds until silence
cathedrals
built for reverb before microphones existed
fake space
plugins simulate halls that never existed
NASA chamber
world's quietest room kills it entirely
for instance

taj mahal dome — marble chamber in agra, india with 28-second echo creating distinctive reverb effect

reverb pedal boss rv-6 — popular guitar effects unit that simulates room acoustics, widely used since 2004

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