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1. A room or enclosure with acoustically reflective walls used in broadcasting and recording to produce echoes or similar sound effects.
2. An institution or environment in which one set of views predominates and dissenting viewpoints are squelched, ridiculed, or ignored: "Napoleon's vision of himself as a 'superior man' had been confirmed to him time and again by events and by the echo chamber of his own propaganda machine" (David A. Bell).
(General Engineering) 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
a room or studio with resonant walls for broadcasting or recording echoes or hollow sound effects.
A group of bloggers that repeat and reinforce each others opinions.