Q: For example, you have fans in your case evaluated as follows:
CPU Fan – 46db
3 case fans – 35dB-each.
–
Total: 151db
Is this how the noise levels are added correctly? Whether it is in fact lower, and you take an average number of species? The threshold of pain in human hearing is around 115-140dB. Of course the case itself will cripple some of the natural noise, but not much. Ive never been around a system that was too loud that I could not handle. But I am building a new system and I am afraid that the larger, faster fans, especially the CPU fan noise will be much to add.
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Re:Yes, it is done logarithmically. Here's a link to how to do it:
Decibels (http://www.steve-o.com/public/unc/decibel/contents.html#sec3)
It's actually not that hard. I wrote a program for my calculator that adds decibels for me. Here's the main part of the source:
Disp "1?
Input A
Disp "2?
Input B
A/10->Q
10^Q->U
B/10->O
10^O->L
U+L->C
log(C)->D
D*10->E
Disp E
Hopefully you can understand that, it's not terribly complex.
Note: One simple thing with decibels is when you are adding something to itself (i.e. two 35 dB case fans), you just add 3. So 35 dB + 35 dB would equal 38 dB, and 20 dB + 20 dB would equal 23 dB.
Hope that helps!
J3
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Re:I believe you add them logarithmically
IE. 25dB(A) + 35dB(A) is added with the formula
= 10 * log (10^(25/10) + 10^(35/10))
= 10 * log (316 + 3162)
= 10 * log (3478)
= 10 * 3.541
= 35.41 dB(A)
so the 25dB fan would have very little effect on the 35dB one.
Keep in mind that fans inside or at the back of the case will seem quieter becuase of the case itself blocking the sound, while your front mounted fans will seem a bit louder
Also "twice" as loud is approx. 10 dB(A)
BTW, your case would be about 47 dB(A), assuming all fans were outside. Inside the case probably drops the sound to maybe 40-45…That's just a guess.
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Re:Yeah I know you don't just add em. Hehe, I have a 1200 watt system in my car and it gets about 145-155db. I can't ever listen to it like that. I take it to audio competitions and turn it up. That would be loud as hell to have 155dbs of fans in your PC, lol.
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Re:I can't tell you how they are added up, but I am pretty sure you don't just add the total, cuase 151 Db would prolly kill you. LOL
I don't think you take the average either, cause if you have all 30Db fans, i am pretty sure they all produce more then 30Db together. I would like to know for sure as well.
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