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| General Liquid/Water Cooling Discussion For discussion about Full Cooling System kits, or general cooling topics. Keep specific cooling items like pumps, radiators, etc... in their specific forums. |
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03-30-2002, 12:22 PM
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#1 |
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Cooling Neophyte
Join Date: Aug 2001
Location: UK
Posts: 17
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Noise of two fans
If a fan gives noise 20 dba, what noise two fans give - 23 or 26 dba? Or maybe, both answers are wrong?
Thank everybody. Leon |
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03-30-2002, 01:38 PM
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#2 |
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Cooling Savant
Join Date: Feb 2002
Location: Dark Side of the Moon
Posts: 365
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23dBa - read this recent thread
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03-30-2002, 02:24 PM
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#3 |
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Slacking more than your weird uncle
Join Date: Nov 2000
Location: San Diego, CA (UCSD) / Los Angeles, CA (home)
Posts: 1,605
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I'm not sure if this is right so somebody correct me if I'm wrong, but I think that for every dBA increase of 1, the noise level doubles... that this is a logarithmic scale. Yes? No?
-Kevin
__________________
I used to throw hot coffee all over the ass of the horse there, then whip him while he was kickin' at me. Those f***in things are crazy. |
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03-30-2002, 03:38 PM
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#4 |
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Cooling Savant
Join Date: Feb 2002
Location: Dark Side of the Moon
Posts: 365
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Kevin - yes dBa is a log scale. No, increasing by 1dB on a log scale isn't 2x. Log scales go like this:
3dB = 2x 6dB = 4x 9dB = 8x 10dB = 10x 13dB = 20x 20dB = 100x etc. Remember dBa is a measure of the sound intensity, which isn't the same as "loudness". What you may be thinking of is the Bel scale (Lw(a)). It is also a log scale, but created for "loudness" measurements. 1 Bel = 10dBa. ps - now go read the other thread I linked to bro
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