echo chamber definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a room used in recording and broadcasting to increase resonance, produce echo effects, etc.
echo chamber definition by American Heritage Dictionary
A room or enclosure with acoustically reflective walls used in broadcasting and recording to produce echoes or similar sound effects.