http://www2.sfu.ca/sonic-studio/handbook/index.html

Heres something I just learned. The decibel system is not added or subtracted, for example a 60 db sound is 10 times louder than a 50 db sound.

Some decibel ratings:I'm working on a report of pollution in the ocean and I'm doing a section on noise pollution. Some underwater oil drilling companies use these air cannons to find oil. Those are over 250 db..

 

That'll kill a bitch.

 

Mind if I use your quote in my paper? :lmao:

 

Be my guest :chuckles:

 

And to think that a loud stereo system in your car can put out 160 dB's.

The decibel system is weird, the average human equates a 3 dB gain as being twice as loud as before.



Well on second thought, maybe thats not right. Maybe its like, to gain 3 dB's you have to double the power... I think the average human can't tell the difference between a 3 dB gain....

It's been a while.

 

Sheesh! Heres some more examples of decibels...

 

i dont get it... all these deppend on how far you are from the point of origin right?

 

sound travels in waves through any medium, whether its air molecules or water molecules. so basically, yeah the farther away you are from the source, the more distorted and quieter it gets just from propagating. but thats why you cant hear anything in outer space; there is no medium, its a vacuum.

its that human ears wont detect a significant increase/decrease in volume w/ anything less than 3dB intervals. and the decibel system is logarithmic, so increase in dB are exponential and not linear.

and im not sure if im remembering this right, but i think its either a 3 or 10dB increase that requires twice the amount of power. so like 60dbs is 200W, then 70cb would require 400W of power. reaching 160 dBs in your car would def require tons of power.

 

ok so how can they say "130 db Jackhammer or machine gun" if no distance is given?

 

id assume they were talkin w/in a couple hundred feet. sound travels at about 1000ft per second, so anything w/in that would still be able to hear it loud and clear so long as there are no obstacles like trees, houses, or masses of people in the way. but yeah, the closer you are, the more it'll sound like your ears are exploding.