Background sound levels in testing areas
| Background sound levels measured | ||||
|---|---|---|---|---|
| Octave band (Hz) | Minimum | Maximum | Mean (SD) | Maximum dB allowed |
| 500 | 20.9 | 68.7 | 44.8 (11.2) | 19.5 |
| 1000 | 12.3 | 61.3 | 41.4 (10.7) | 26.5 |
| 2000 | 11.2 | 58.1 | 38.1 (10.5) | 28.0 |
| 4000 | 11.3 | 55.1 | 32.7 (10.6) | 34.5 |
| 8000 | 12.1 | 51.1 | 28.1 (9.6) | 43.5 |