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Is noise cumulative?

post #1 of 17
Thread Starter 
As the title says,I been wondering whether or not noise is cumulative. For an example say I have 5 fans 3 fans produce 30dB and 2 produce 50dB, so in total is the noise going to be 190dB? Obviously not or everyone would be deaf but I was wondering if say the noise is capped at 50dB or does all the noise bump it up to say 65dB or 70dB like the concept of a large crowd chanting.
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Rex Machina
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post #2 of 17
Highest db will be the noise level, but lots of noise sources can echo and contribute to peak db.
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post #3 of 17
GPU usually ends up being the loudest out of all the fans in your case.

My 6850 is set at 55% and without my headphones on a hear a constant high pitched humming noise, but in all like djk11 said the loudest noise usually sets the tone for how loud it is going to be.
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post #4 of 17
sound is in waves, 2x identical sources with opposing waves can cancel eachother out

extremely unlikely to happen in real-world situations tho

from the math
max = all db sources added together
min = highest db source - lowest db source

its difficult to say what will be the final db of your system until you build it
post #5 of 17
Thread Starter 
Quote:
Originally Posted by djk11 View Post
Highest db will be the noise level, but lots of noise sources can echo and contribute to peak db.
Ahh good point hence the padding in some cases to reduce vibrations/echos.

Quote:
Originally Posted by Bobicon View Post
GPU usually ends up being the loudest out of all the fans in your case.

My 6850 is set at 55% and without my headphones on a hear a constant high pitched humming noise, but in all like djk11 said the loudest noise usually sets the tone for how loud it is going to be.
Yeah I can emphasize, I for one don't mind fan noise(I have fans on highest settings,always) but my 6870's blower fan is something else. I live in NYC and that thing is about as loud as a bus passing
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post #6 of 17
I can tell you this for sure. I have 2 Deltas that hit 3400RPM max. When I have just one on my Heatsink at full speed, its definitely quieter than if they are in push/pull full speed. But I dont think they are twice as loud.
post #7 of 17
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post #8 of 17
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)
post #9 of 17
Noise is not cumulative.
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post #10 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.
This, since we are using a logharitmic scale for sound....
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