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Proposed, is a method of rating microphones and loudspeakers whereby the over-all performance of a sound system may be determined by adding together the microphone and loudspeaker ratings and the gain of the interconnecting network. This sum gives the performance quite accurately for most systems. However, in some combinations of elements correction terms must be added. The formulas for these correction terms are derived. The proposed microphone and loudspeaker ratings have the additional usefulness of being in a form which permits the comparison of instruments of different impedances.