Definitions for echo chamber
Random House Webster's College Dictionary
a room or studio with resonant walls for broadcasting or recording echoes or hollow sound effects.
Category: Hi-Fi and Audio
Origin of echo chamber:
A room or other enclosed space that is highly conducive to the production of echoes, particularly one that has been designed and built for this purpose.
In music production, a sound effect that may be applied to live or recorded sounds through a sound editing process, which creates the impression that the sounds originated in an enclosed space which was conducive to echoes.
An insular communication space that is of no interest to outsiders or refuses their input.
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