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250. 500. 1000. 2000. 4000. 8000 Hz. Functional Gain: The way hearing aid gain was 1st verified. 0. A. A. 10. A. 10. 20. 15. A. A. A. 2 0. 30. 40. 3 0. 30. 30. 50. 60. Aided Speech output. 70. 80. 90. 100. LDL for speech. 110. 120. Figure 1. Then Came

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  1. 250 500 1000 2000 4000 8000 Hz Functional Gain: The way hearing aid gain was 1st verified 0 A A 10 A 10 20 15 A A A 20 30 40 30 30 30 50 60 Aided Speech output 70 80 90 100 LDL for speech 110 120 Figure 1

  2. Then Came Insertion Gain: Aided vs Unaided SPL at the TM 120 * 110 REAR REUR Target REIG dB SPL at TM 100 90 80 70 60 50 40 * 30 * * 20 dB Gain * * 10 * 0 250 500 1000 2000 4000 8000 Frequency Figure 2

  3. Today we use Insitu Output: Map Soft, Average, Loud speech into remaining Dynamic Range 120 * * * 110 * * * * * 100 dB SPL at TM 90 80 70 60 50 40 30 LDL * * * Normal HL * * * Targets: Loud Average Soft 20 * * * * * 10 * 0 250 500 1000 2000 4000 8000 Frequency Figure 3

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