13
3. Appendix
3. Appendix
GAIN
Based on the user’s audiogram at 500 Hz, determine the half-rule gain as follows:
THR
500 Hz
2
= dB
Gain:
In this example the threshold for 500 Hz is at 60 dB. So the gain is:
60 dB
2
= 30 dB.
0
125
250
500
1000
2000
4000
8000
10
20
30
40
50
60
70
80
90
100
110
120
Frequency (Hz)
dB
Fig. 14 Audiogram threshold at 500 Hz
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