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Riporto quello che c'è scritto nel sito Arctic Cooling.
The noise level is measured in Sone (loudness) instead of dB (sound pressure).
The loudness depends upon ears response curves and tells you exactly, how bothering a certain noise is. Sone takes the frequency and bandwidth of a sound into account.
A doubling of the number of Sones sounds to the human ear like a doubling of the loudness.
The comparison of products from different manufacturers is basically impossible, since all manufacturers measure in different ways. Even a rough translation from Sone to dB doesn't help. A 15dB cooler can be louder than a 1 Sone cooler from another manufacturer.
Nevertheless with the Sone data you can compare our coolers between each other and get a quite precise idea how annoying the product will be.
1 Sone: nearly inaudible in a computer case
2 Sones: clearly audible
3 Sones and more: disturbing
Ci fidiamo? E prendiamo come convenzione (a spanne) che 1 sone alla frequenza riprodotta dalle ventole equivale a circa 15dBA?
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