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Frequency specific thresholds of N4 and N6 standard audiograms [39]. The threshold at 750 Hz for the N6 audiogram was originally 82.5 dB HL but had to be rounded to 85 dB HL to allow input into the verification system.
| Audiogram | Frequency specific thresholds (dB HL) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 250 | 500 | 750 | 1 kHz | 1.5 kHz | 2 kHz | 3 kHz | 4 kHz | 6 kHz | |
| N4 | 55 | 55 | 55 | 55 | 60 | 65 | 70 | 75 | 80 |
| N6 | 75 | 80 | 85 | 85 | 90 | 90 | 95 | 100 | 100 |
