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echo chamber

noun
1.
a room or studio with resonant walls for broadcasting or recording echoes or hollow sound effects.
Origin
1935-1940
1935-40, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for echo-chamber

echo chamber

noun
1.
a room with walls that reflect sound. It is used to make acoustic measurements and as a source of reverberant sound to be mixed with direct sound for recording or broadcasting Also called reverberation chamber
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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9
9
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