Comments by "Tim Bushell" (@timbushell8640) on "" video.
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Couple of points, dB'A'... yes, biased to human reaction. 65dB is the normal minimum for fire alarm sounds because as you said - it starts to get annoying. And in sound power terms... 60dB plus 60dB is, er, 63dB, so without checking, I think most of your 'doubling' sounds are wrong.
Otherwise - yes, great vid, and yes, would help... us all when walking the streets or sleep, if traffic noise was way, way, way less.
Basic SPL math, really depends on the difference between the two items - as below, enjoy;
To add two or more noise levels, if the difference between the highest and next highest noise level is:
0–1 dB then add 3 dB to the higher level to give the total noise level.
2–3 dB then add 2 dB to the higher level to give the total noise level.
4–9 dB then add 1 dB to the higher level to give the total noise level.
10 dB and over, then the noise level is unchanged (i.e. the higher level is the total level)
So, 35 dB plus 35 dB equals 38 dB... ... Goggle it : )))))
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