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
2. informal
an environment, esp on a social media site, in which any statement of opinion is likely to be greeted with approval because it will only be read or heard by people who hold similar views
echo chamber in American English
a room used in recording and broadcasting to increase resonance, produce echo effects, etc.