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Anechoic chamber at the Harvard Acoustics Research Laboratory. "An anechoic chamber is also a kind of prosthesis, serving to eliminate sound reflections in a room. Bell Labs built the first one, and Harvard's Acoustics Research Laboratory also built one. ( See Beranek's Box by Laci Videmsky for a short film on the anechoic chamber at Harvard ) John Cage famously sat in Harvard's anechoic chamber for a period of time and emerged with a striking observation: I heard two sounds, one high…

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Vincent Fournier - Anechoic Chamber, European Space Research and Technology Centre [ESTEC], Noordwijk, The Netherlands, 2008.

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Reverberation time of a balloon pop: reverb room vs. anechoic chamber

The anechoic and resonating chambers of DTU 'an anechoic chamber (an-echoic meaning non-echoing or echo-free) is a room designed to completely absorb reflections of either sound or electromagnetic waves. they are also insulated from exterior sources of noise. the combination of both aspects means they simulate a quiet open-space of infinite dimension, which is useful when exterior influences would otherwise give false results.'

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We all crave it, but can you stand the silence? The longest anyone can bear Earth's quietest place is 45 minutes

The 'anechoic chamber' at Orfield Laboratories in South Minneapolis is 99.99 per cent sound absorbent and holds the Guinness World Record for the quietest place.

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