| brand/model | NRR | 125 | 250 | 500 | 1000 | 2000 | 3150 | 4000 | 6300 | 8000 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Aearo / EARsoft FX | 33 | Mean | 40.8 | 40.8 | 43.6 | 41.8 | 37.9 | 45.2 | 47.6 | 49.0 | 46.8 |
| Standard Deviation | 2.9 | 3.5 | 4.0 | 3.8 | 2.6 | 2.8 | 3.5 | 3.8 | 4.3 | ||
| Howard Leight / laserlite | 32 | Mean | 36.8 | 38.0 | 40.4 | 41.1 | 40.1 | 44.4 | 48.5 | 46.4 | 45.8 |
| Standard Deviation | 4.0 | 4.5 | 5.5 | 4.0 | 2.7 | 4.5 | 4.1 | 5.4 | 5.2 | ||
| Howard Leight / MAX-lite | 30 | Mean | 33.5 | 33.6 | 36.0 | 37.5 | 39.4 | 42.5 | 43.9 | 43.7 | 45.2 |
| Standard Deviation | 3.6 | 3.4 | 3.2 | 3.5 | 3.5 | 3.4 | 5.1 | 4.8 | 5.1 | ||
| Howard Leight / MAX | 33 | Mean | 33.1 | 36.3 | 36.8 | 38.4 | 38.7 | 44.1 | 45.9 | 45.4 | 46.2 |
| Standard Deviation | 2.8 | 1.8 | 2.1 | 1.7 | 2.1 | 2.3 | 2.2 | 2.3 | 2.4 | ||
| Moldex / Pura-fit | 31 | Mean | 32.8 | 34.7 | 37.9 | 38.1 | 38.6 | 42.8 | 44.6 | 44.7 | 43.9 |
| Standard Deviation | 4.0 | 3.8 | 3.1 | 3.0 | 2.9 | 2.9 | 3.6 | 4.1 | 4.6 |