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echo chamber

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echo chamber

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

Origin:
1935–40, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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echo chamber  
n.  A room or enclosure with acoustically reflective walls used in broadcasting and recording to produce echoes or similar sound effects.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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