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Reference Equivalent Threshold Sound Pressure Level (RETSPL).
| 250 | 500 | 1000 | 2000 | 4000 | 8000 | |
|---|---|---|---|---|---|---|
| ER 3A | 14.5 | 6.0 | 0 | 2.5 | 0 | −3.5 |
| HearTest v1 | 11.8 | 9.5 | 6 | 2.3 | 6.7 | 16.2 |
| HearTest v2 | 1.8 | −5.5 | 1 | 7.3 | 13.7 | 13.7 |
ER-3A: ANSI S3.6-2010, American National Standard Specification for Audiometers, Acoustical Society of America, HearTest v1: RETSPLs for Apple Earpods, Ho et al. [27], HearTest v2: calibrated using subjective test model based on ER-3A and HearTest v1.
