5db
The ordinary tolerance limit for sound by human beings is around 85 decibels. Prolonged exposure to sounds higher than 85 decibels can cause hearing damage. The maximum limit before pain begins is around 120-130 decibels.
Go through the chart at the link below. Scan the whole chart; some levels are described more than once. Normal conversation is about 60 decibels, and ordinary piano practice is between 60 and 70 decibels.
Power (Watts)/ Decibels (if the speaker is efficient) 2 Watts = 93 decibels 4 Watts = 96 decibels 8 Watts = 99 decibels 16 Watts = 102 decibels 32 Watts = 105 decibels 64 Watts = 108 decibels 128 Watts = 111 decibels 256 Watts = 114 decibels 512 Watts= 117 decibels 1024 Watts = 120 decibels Some Volumes to Compare 10 decibels = normal human breathing 60 decibels = normal human conversation 110 decibels = power saw, car horn, shouting in ear, 120 decibels = jet aircraft close by, emergency vehicle siren, rock concert
20 decibels is considered a very quiet sound, similar to a whisper or rustling leaves. It is around the noise level of a ticking watch.
DeciBels
The volume level of a sound that registers at 55 decibels is 55 decibels.
20 decibels
do decibels change to wavelength
The abbrevation used for decibels is dB.
The usual symbol for decibels is dB.
207 decibels.
Decibels are a measurement of the loudness of sound.