Does noise add up?

[Lydecker]

Would 2 cooling fans if the same db level produce the same noise as just one?

Thanks

 

[J3anyus]

No. Two fans of the same noise level would be 3dB louder than just one.

 

[Lydecker]

Originally posted by: J3anyus
No. Two fans of the same noise level would be 3dB louder than just one.

Do I sence sarcasm?

 

[J3anyus]

No...when you add decibels, it's logarithmic. It ends up being about 3dB louder when you have two things of the same noise level put together. So, 30dB + 30dB = 33dB, and 20dB + 20dB = 23dB. That's how it works. If you still don't believe me, search google for a decibel calculator and check for yourself.

 

[chopstxxx]

Originally posted by: Lydecker

Originally posted by: J3anyus
No. Two fans of the same noise level would be 3dB louder than just one.

Do I sence sarcasm?

No. Dbs are on a logarithmic scale so doubling the noise results in an increase of about 3dbs.

 

[Lydecker]

cool thanks!

 

[Budman]

Originally posted by: Lydecker
Would 2 cooling fans if the same db level produce the same noise as just one?

Thanks

Of course it adds up.

1 person yelling at a concert is much more quiet than 10 thousand.

 

[BoomAM]

yes it does add up but i dont think it goes up by 3dBa each time. i used a calcualter and it only goes up by 0.1 or 0.2. so 20dBa +20dBa = 20.2dBa, not 23dBa
very 3dBa double the noise level.

heres a dBA calculater
Click Here for enlightenment

 

[PCHPlayer]

Originally posted by: BoomAM
yes it does add up but i dont think it goes up by 3dBa each time. i used a calcualter and it only goes up by 0.1 or 0.2. so 20dBa +20dBa = 20.2dBa, not 23dBa
very 3dBa double the noise level.

heres a dBA calculater
Click Here for enlightenment

Fixed link here.


Ummm. No. Since the decibel scale is a 10*logrithmic scale it goes up 3 db instead of .3 db when doubling the sound pressure. The richter (sp?) scale is a good example of a pure logarithmic scale. A 6.3 earthquake is twice a strong as a 6.0.
I also went to the above link and it said 20 + 20 = 23.