In the realm of audio technology, the term "echo chamber" refers to a room or space that is used to produce reverberated sounds, typically to enhance recordings in music production. In these rooms, sound waves reflect off the walls and combine at different times to create a natural "echo" effect. 

The usage of echo chambers in audio technology predates the more metaphorical use of the term. These were particularly popular in the mid-20th century, before digital reverb technology was readily available. Musicians and producers would play sounds into a specially designed echo chamber and then record the result, which would include both the original sound and the echoes.

Phil Spector, a famous record producer, is well known for his "Wall of Sound" technique, which heavily used echo chambers to create a lush, full sound in the recordings. Capitol Studios in Los Angeles had a particularly well-known set of subterranean echo chambers that were used on many classic recordings.

The technology and techniques have evolved over the years, with digital reverb and delay effects largely replacing physical echo chambers in modern music production. However, the term "echo chamber" remains a part of audio engineering vocabulary and some studios still use these physical chambers to achieve a particular, often vintage, sound.
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