4.0 sones → loud (≥ 60 dB(A))
Here are the most authoritative sources that verify and define the conversion: sone to dba verified
Or using common log (( \log_10 )):
When navigating the worlds of HVAC, product manufacturing, or acoustic engineering, you’ll often run into two different ways of measuring sound: and dBA (A-weighted decibels). While they both describe noise, they speak different languages. or acoustic engineering
: 2 sones is exactly twice as loud as 1 sone. 4 sones is twice as loud as 2 sones. The Baseline : 1.0 sone is roughly the sound of a refrigerator running in a quiet kitchen. Broan-NuTone The Conversion: Sone to dB Verified sone to dba verified