Comparing dB and dBA: Understanding Differences in Sound Intensity Measurements for Fans

Hello
Well, I'm interested in how dB is compared to dBA.
The information I was able to find showed that dBA represents the amount of dB that corresponds to the listener's experience. However, when I bought a fan that was supposed to work at 21dBA, I was unpleasantly surprised by the huge difference between another, almost inaudible 21dB fan.
How are dB actually compared to dBA?

Hey, a decibel is a decibel, you got the wrong look because it should be: dB (A) that is on the acoustic scale, but it doesn't always add up. Greetings.

So dB and dBA / dB (A) are exactly the same when it comes to sound intensity?

Well, I bought a fan that has 19dBA and is louder than the GlacialTech I wrote about earlier. I found a box from him and it turned out to be 20dBA ...
it's a bit of a strange thing ...

While searching for the answer, I found a certain page (http://www.digit-life.com/articles2/glacialte...cialtech-socketa-coolers-shootout-nov2k3.html " target="_blank" rel="nofollow noopener ugc" class="postlink inline" title="" > http://www.digit-life.com/articles2/glacialte...cialtech-socketa-coolers-shootout-nov2k3.html ) pay attention to the table at the bottom.
First of all there is some explanation "A-weighted sound level" - I don't know English very well so I'm curious how you interpret it
Secondly, GlacialTech Silent Breeze 462 II - which I have and which is supposed to have 20dBA has 30dbA here. (This fan is almost inaudible in the city during the day)

dBA is the maira of sound intensity as a weighted average z measured over time with some background noise, i.e. it is a kind of relative loudness

in the link you provided:
"The background noise is 19 dBA"

I hope I helped
greetings

Quote:

dBA is the maira of sound intensity as a weighted average z measured over time with some background noise, i.e. it is a kind of relative loudness

Does everyone calculate this value according to specific parameters - e.g. measurement duration, the same weights or are they any?
I will not ask about the weights anymore, but if someone knows a published article, I would like to read it (unfortunately it is difficult to find something by typing dBA because it is equivalent to the word cares)

Quote:

in the link you provided:
"The background noise is 19 dBA"

I saw it, but I have no idea how with 20dBA and 19dBA it comes out 30dBA

"A-weighted sound level" means the A-weighted sound level measurement.

This curve reflects the changes in the ear's sensitivity to signals of different frequencies (the ear is most sensitive in the 1-4kHz range, outside of this range the ear sensitivity drops).

Obviously, this curve corresponds to the averaged hearing characteristics and does not take into account the phenomenon of a dynamic change in the frequency characteristics of the ear.

As for the fan, the problem may be that it is not really known under what conditions the noise level caused by the fan was measured and the results may be incomparable. Besides, the 1 dB difference is quite hard to hear If you can hear a difference then there must be a lot more than 1 dB difference in levels.

So there is no other way to determine fan noise than a reliable source review?

This would be in line with what I see on my fans (19, 20, 21 [dBA]). The one with 19 dBA is incomparably louder than the one with 20dBA, and the one with 21 is a little louder than the one with 19dBA ...

And there are no minuses with these numbers? Then it would make sense that -19 dBA is noisy than -21 dBA

I don't see any downsides

These fans are:
21dBA - Silent Cat 90mm
20dBA - cooler - GlacialTech Igloo Silent Breeze 462 II
19dBA - cooler - Spire WhisperRock 5

So my conclusion from the previous post is not true?

I also have a DO8T-12PM S fan - 21dB also quieter than the Spire WhisperRock 5, but louder than the GlacialTech Igloo Silent Breeze 462 II ...

This is an interesting matter - if anyone knows what it is, I will be grateful for the answer.