echo chamber

noun
a room or studio with resonant walls for broadcasting or recording echoes or hollow sound effects.

Origin:
1935–40, Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
echo chamber
 
n
Also called: reverberation chamber 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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
But on the right the echo chamber is louder and more tightly sealed.
Now you say to give an example of whats been falsified, wow, you don't get out of your echo chamber much do you.
Apparently the echoes in the echo chamber he has immersed himself in have overcome any sense of perspective or professionalism.
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