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Is noise cumulative? - Page 2

post #11 of 17
Quote:
Originally Posted by AdmiralThrawn View Post
Noise is NOT cumulative. To create an increase of 2.5dB, you need to DOUBLE your volume. For example, 30dB is ten times louder than 20dB.

(PS Decibels is NOT a measure of volume, it's a measure of pressure)
To expand on this. The human ear's perception of something being twice is loud at around 8-10db increase. So if you had 1 30db fan and you added a second, you wouldn't perceive it to be twice as loud. A 3 db increase around 30 decibels isnt going to be some huge gain in how loud it is.
Edited by M0E - 2/14/11 at 12:24am
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post #12 of 17
Edit: wait, wrong thread.

IGNORE THIS POST. BY ORDER.
post #13 of 17
Quote:
Originally Posted by AdmiralThrawn View Post
Edit: wait, wrong thread.

IGNORE THIS POST. BY ORDER.
Yes sir, post ignored.

Ah crap...
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post #14 of 17
Sound is not cumulative.



As you can read from the graph, 480 SLI is only 6 dB(A) louder than a single 480.
post #15 of 17
Thread Starter 
Quote:
Originally Posted by 808MP5 View Post
Thanks! It seems about what I'd expect.

Quote:
Originally Posted by AdmiralThrawn View Post
Noise is NOT cumulative. To create an increase of 2.5dB, you need to DOUBLE your volume. For example, 30dB is ten times louder than 20dB.

(PS Decibels is NOT a measure of volume, it's a measure of pressure)
Then what is the measurement of volume? Also why are fan noises measured in pressure rather than volume?
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post #16 of 17
Though noise isnt cumulative,
a fan pushing 30dB against a wall will seem much louder than a fan pushing 30dB in free air.
hopefully this adds a little more relevance to the figures.
Also the frequency at which the SPL is measured also has a bearing on the perception of noise.
Human ears are more susceptible to mid and high frequency sounds - though low end sound/droning can cause fatigue over drawn out periods.
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post #17 of 17
Quote:
Originally Posted by shuojinz View Post
Then what is the measurement of volume? Also why are fan noises measured in pressure rather than volume?
Sound pressure is a physical quantity that can be measured with equipment. The instrument measures the pressure in Pascal units. You plug this value into a logarithmic formula to determine dB.

Volume or loudness is how humans perceive sound. Loudness is not a quantity that can be physically measured. We can determine sound pressure levels where humans perceive the volume to be twice as loud though.

You can read more about decibels and sound here.
Edited by Riou - 2/14/11 at 7:08am
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