90 db
Ballpark? 25 - 30 dB.
(90 dB - 70 dB) = 20 dB = 100 times as much sound power.(100 times 'as much' = 99 times 'more')
90 db
90 decibel is 32 sones.
90 db
Sounds from 90 db and up can eventually damage hearing. but 95db is equivalent to a subway train from 200 feet.
On average, a train horn is 110 db on the engine. At about 500 feet away from the train, a train horn is 90 db.
90 > 70
100 dB
A avalanche can range from 100 dB to 180 dB
It is equivalent to the noise of the conversation of a group of 40 or so in a smallish restaurant. Such a level is dangerous for the hearing for more than four hours of exposure: either go outside for a break from time to time or wear earplugs.
Since the db scale is relative, it depends on what 0 db means. Typically, however, 69 db is a very soft sound, almost a whisper.
That's the sound of the Earth disintegrating.
Ballpark? 25 - 30 dB.
About 132 dB(A)
The sound pressure of 45 dB is about a quiet library and 50 dB is about an everage home.