Battery powered solid state amplification has made possible integrated portable sound reinforcement systems which are installed and controlled by the talker. Because such systems are, by nature, -central loudspeaker systems,- naturalness-or the listener's illusion of no reinforcement-is enhanced. Naturalness can be further enhanced by utilizing the difference between the near and far field pressure characteristic of the human voice regarded as a doublet. Since the listener is conditioned to expect this difference, a system designed to accommodate this expectation will sound natural.
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