How do you calculate SPL distance?
In a free field – a doubling of the distance from a noise source reduces the sound pressure level with 6 decibel. A “free field” is defined as a flat surface without obstructions….Example – Rifle Shot and Sound Pressure at Distance.
| Distance (feet) | Sound Pressure Lp (decibel) |
|---|---|
| 1.25 | 134 |
| 2.5 | 128 |
| 5 | 122 |
| 10 | 116 |
How do you calculate noise reduction distance?
For every doubling of distance, the sound level reduces by 6 decibels (dB), (e.g. moving from 10 to 20 metres away from a sound source).
How does dB reduce with distance?
According to the inverse square law, it can be shown that for each doubling of distance from a point source, the sound pressure level decreases by approximately 6 dB.
How does sound level change with distance?
Sound intensity is inversely proportional to the square of the distance from the sound wave source. Since sound waves carry its energy though a two-dimensional or three-dimensional medium, the intensity of the sound wave decreases with increasing distance form the source.
How far does 120 decibels travel?
approx 18m
This simple principle is often forgotten in the need to cover large and noisy areas. The effective distance of a 100 dB(A) sounder in a very noisy environment is 1.8m, the distance for a 120 dB(A) sounder is approx 18m (10 times the distance).
How far away can you hear 80 decibels?
100 feet
As a general rule, if a sound is 80 dB at the source, its intensity will decrease by 6 dB each time the distance from the source doubles. Therefore, under normal conditions, you will probably be able to hear an 80 dB up to 100 feet or 30 meters.
How far away can 100 dB be heard?
16 meters
In fact, each time your distance from the source doubles, the sound decreases by 6 dB. If a sound is 100 dB at the source, it will be 94 dB at 1 meter, 88 dB at 2 meters, and so on. Therefore, you will generally be able to hear a 100 dB sound at a maximum of 16 meters.
How far does 60 decibels travel?
How Loud Is 60 Decibels? 60 decibels is as loud as a normal conversation between two people sitting at a distance of about one meter (3 ΒΌ feet). It is the average sound level of a restaurant or an office.
How far can 130 dB travel?
As sound travels, its intensity decreases by about 6 decibels for each doubling of the distance. For example, a 130 dB sound at the source will be 124 dB at 1 meter, 118 dB at 2 meters, and 112 dB at 4 meters.
What does 77 dB sound like?
| Noise Source | Decibel Level |
|---|---|
| Passenger car at 65 mph at 25 ft (77 dB); freeway at 50 ft from pavement edge 10 a.m. (76 dB). Living room music (76 dB); radio or TV-audio, vacuum cleaner (70 dB). | 70 |
| Conversation in restaurant, office, background music, Air conditioning unit at 100 ft | 60 |
How far away can you hear 70 dB?
Distance and perception of voice.
| Distance | Voice Level (dB PSIL) | |
|---|---|---|
| (ft) | (m) | Normal |
| 1 | 0.3 | 70 |
| 3 | 0.9 | 60 |
| 6 | 1.8 | 54 |
How far can 100 decibels travel?
If a sound is 100 dB at the source, it will be 94 dB at 1 meter, 88 dB at 2 meters, and so on. Therefore, you will generally be able to hear a 100 dB sound at a maximum of 16 meters.