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 Post subject: Newbie Question: Less fans or less voltage?Posted: Thu Sep 26, 2002 7:00 am

Joined: Thu Sep 26, 2002 6:42 am
Posts: 27
I'm sure this has been answered before but I can't seem to find it on this site. If dealing with two fans of the same size and model (say a Panaflo L1A), which gives better noise-reduction: dropping both fans voltage down to either 7 or 5 volts or to remove one fan and leave the other running at 12 volts? Is there possibly a formula for this or would it depend more on the model of the fan, location in the case, etc?

Thanks,

Todd

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Todd.

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 Post subject: Posted: Thu Sep 26, 2002 7:17 am

Joined: Sun Aug 11, 2002 3:26 pm
Posts: 262
Location: Worcester, UK
Hiya! Welcome to the forum!

Well, as you say it does depend to some extent on other factors such as your case etc. But i would say that almost without doubt 2 fans @ 5 or 7V will be the best solution.

Lets say that you were using M1As, and a L1A represented an M1A at 7V (i think this is valid in order to explain this?). Heres their stats,
M1A: 28dB 32CFM
L1A: 21dB 24CFM

so 1 M1A = 28dB and 32CFM
but 2 7V M1As (L1A) = 2x 21dB and 2x 24CFM = 24dB and 48CFM.

(You know dB are logarithmic?)

so two fans at 7V is less than half as loud and gives 50% more airflow...

If your unsure about the dB sums just say and ill elaborate

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 Post subject: Posted: Thu Sep 26, 2002 7:36 am

Joined: Thu Sep 26, 2002 6:42 am
Posts: 27
Makes perfect sense. Thanks!

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Todd.

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 Post subject: Posted: Sat Oct 12, 2002 6:27 pm

Joined: Sat Oct 12, 2002 6:23 pm
Posts: 10
Check out this very useful interactive chart right here:

http://www.silentpcreview.com/files/fan ... nspecs.xls

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