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45dba how loud is it - Page 2

post #11 of 27
Quote:
Originally Posted by onlycodered View Post
He just said it was 60 dB. Also, it depends on how far away you are from the sound source. You could measure the noise of a fan from a couple centimeters away and the dB rating would be much higher than if it were measured from 1 meter away.
...or from like 8-20m away.... *looks at SilenX*
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post #12 of 27
The new Dishwasher I just bought is rated at 53db at ten feet and this is about average for a newer dishwasher. So just do the dishes and and stand a little further away and you'll be about 45db.
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post #13 of 27
Quote:
Originally Posted by DuckieHo View Post
...or from like 8-20m away.... *looks at SilenX*
Yes. A prime example. I hate how SilenX does that. It's false advertising if someone doesn't know about how decibels are rated.
 
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post #14 of 27
Quote:
Originally Posted by Rev1 View Post
Decibel scales are logarithmic, meaning 25dB is 10 times "quieter" than 26dB ... (log of 10 = 1)
Not quite...everytime you double a sound's power, it increases by 3 dB. So 28dB is twice as loud as 25dB, which is twice as loud as 22dB and so on. Not sure if this is correct, but I know it is not a x10 increase over every decibel.
Edited by Jacko87 - 6/24/08 at 11:59am
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post #15 of 27
I have the tricool and Ultra Kaze 3000....The UK-3000 is about just as loud as 10 tricools at full blast.

I can't precisely tell you other than that I can stand a Tricool but not this beast. That's why I have it down to 2000 rpm. I qould get the 2000rpm one for not too much of a performance hit if you don't have a controller.
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post #16 of 27
Also, I should note that the Tri-cool fans are very loud on full blast. I believe that even the Yate-Loon fans are quieter at the same speeds and they cost much less.
 
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post #17 of 27
Quote:
Originally Posted by Jacko87 View Post
Not quite...everytime you double a sound's power, it increases by 3 dB. So 28dB is twice as loud as 25dB, which is twice as loud as 22dB and so on. Not sure if this is correct, but I know it is not a x10 increase over every decibel.
No, it's not double, look at the sound "power" in watts... its logarithmic:

http://www.engineeringtoolbox.com/so...evel-d_58.html
Quote:
Lw = 10 log ( N / No) (1)

where

Lw = Sound Power Level in Decibel (dB)
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post #18 of 27
Thread Starter 
well im looking for some high cfm fans for my radiator (bix360) that arent too loud
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post #19 of 27
Quote:
Originally Posted by Rev1 View Post
No, it's not double, look at the sound "power" in watts... its logarithmic:

http://www.engineeringtoolbox.com/so...evel-d_58.html
Ok, I'm not sure about power and whatever...but check this out:

http://www.endpcnoise.com/cgi-bin/e/decibels.html

Quote:
The measurement of noise (bels and decibels) is logarithmic. In other words 40 decibels is not just twice as loud as 20 decibels. And, 40 decibels is actually about nine times as loud as 20 decibels. The reason for this is that loudness increases approximately three times for every bel (or 10 decibels). So 30 decibels is three times as loud as 20 decibels. 40 decibels is three times as loud as 30 decibels. This makes 40 decibels nine times as loud as 20 decibels. Loudness itself is quite subjective. What sounds twice as loud to one person may not sound twice as loud to another. To the average human ear, however, an increase of 10 decibels means that the perceivable increase in noise is triple the noise.
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post #20 of 27
Quote:
Originally Posted by Rev1 View Post
No, it's not double, look at the sound "power" in watts... its logarithmic:

http://www.engineeringtoolbox.com/so...evel-d_58.html
That's in Watts, something else albeit similar...
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