Sound Pressure Levels
| Source | SPL (dB) |
| faintest audible sound | 0 |
| whisper | 20 |
| Quiet residence | 30 |
| Soft stereo in residence | 40 |
| Speech range | 50-70 |
| cafeteria | 90 |
| Pneumatic jack hammer | 90 |
| Loud crowd noise | 100 |
| Accelerating motorcycle | 100 |
| Rock concert | 120 |
| Jet Engine (75 feet away) | 140 |
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