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The relative difference values obtained for the ER3A/HA2 2-cc coupler real-ear-to-coupler difference (RECD) measurement procedure and the hearing instrument RECD measurement procedure as a function of frequency for 15 subjects. A positive value indicates that the RECD measured using the hearing instrument transducer generated a higher RECD value at that frequency than the ER3A/HA2 RECD measurement procedure.
