how much noise will three 8dB(A) fans make?
"William Sommerwerck" wrote in
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Assuming they're identical and near each other, three
times the noise. That's about 5dB more.
True only if they are phase-locked. If they are AC powered, there's a
pretty good chance of that. If they are DC powered, then they will be
turning at similar but not identical speeds.
If the fans can be modelled as statistically independent acoustical sources,
then you add their power using the square root of the sum of the squares.
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