An older method of adding reverberation to a sound recording used a reverberant room, containing only a microphone and a loudspeaker, through which an output from a studio or hall was passed in order to allow a variable degree of reverberation to be added to the direct output from the same source. The microphone output was combined with the output of the source and controlled in volume to give a desired degree of reverberation.
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Echo chamber -- An older method of adding reverberation to a sound recording used a reverberant room, containing only a microphone and a loudspeaker, through which an output from a studio or hall was passed in order to allow a variable degree of reverberation to be added to the direct output from the same source. The microphone output was combined with the output of the source and controlled in volume to give a desired degree of reverberation.
