Total case fan DBA?
- Thread starter C0IN
- Start date
Solution
dudewitbow
Dignified
- Apr 11, 2012
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you dont add DB(the DB scale is logrithmic anyways so it will never work out), each fan has a certain noise it makes and each additional fan adds a bit more noise to it. its hard to calculate how much sound it exactly will make.
the only way to test it is using an actual measuring tool. there really isnt a way to do it by hand
the only way to test it is using an actual measuring tool. there really isnt a way to do it by hand
Calculatron
Honorable
- Apr 3, 2013
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Working with decibels is kind of weird, because they don't stack, they scale.
Here is an example of one of the rules of thumb: When you have two sound sources of the same decibel level, for the overall sound, you would add +2 Db. Let us say you only had two 35 db fans, that would give you 37db.
Another rule of thumb is that for every doubling of the distance (1 meter -> 2 meters) you subtract -6 Db. A fan that is 35 Db from 1 meter away would be 29 Db at 2 meters, and 23 at 4 meters.
I added the second example to show more of how the scaling is logarithmic. A lot of people have issues grasping the concept, but think of it kind of like a Richter scale; a level higher is more of another magnitude than anything linear.
For overall decibels, I am not sure how to "do the math" on that one. It's not going to be too much more than 40, if it is, though.
(One last "rule of thumb": within a certain range, a +/- 5 DB change is a "perceivable change" in loudness. +/- 10 is a "definite change" in loudness.)
Here is an example of one of the rules of thumb: When you have two sound sources of the same decibel level, for the overall sound, you would add +2 Db. Let us say you only had two 35 db fans, that would give you 37db.
Another rule of thumb is that for every doubling of the distance (1 meter -> 2 meters) you subtract -6 Db. A fan that is 35 Db from 1 meter away would be 29 Db at 2 meters, and 23 at 4 meters.
I added the second example to show more of how the scaling is logarithmic. A lot of people have issues grasping the concept, but think of it kind of like a Richter scale; a level higher is more of another magnitude than anything linear.
For overall decibels, I am not sure how to "do the math" on that one. It's not going to be too much more than 40, if it is, though.
(One last "rule of thumb": within a certain range, a +/- 5 DB change is a "perceivable change" in loudness. +/- 10 is a "definite change" in loudness.)
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