You searched for: “reverberation chambers”
reverberation chamber (s) (noun), reverberation chambers (pl)
In acoustics, a room having very little audible absorptions: A reverberation chamber has multiple echoes in all directions; so, if a sound is measured at a particular point, it will appear to come equally from all directions.
This entry is located in the following unit: verber-,-verber (page 1)