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Unread 03-30-2002, 12:22 PM   #1
Nomad0
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Default 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.
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Unread 03-30-2002, 01:38 PM   #2
EMC2
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23dBa - read this recent thread
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Unread 03-30-2002, 02:24 PM   #3
Kevin
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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?
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Unread 03-30-2002, 03:38 PM   #4
EMC2
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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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