[ S = 2^\fracL - 4010 ] Where:
Sone ratings are typically measured at a specific distance (e.g., 5 feet for fans). dBA readings change with distance (inverse square law: -6 dB per doubling of distance). An unverified table rarely specifies distance. Always standardize to . sone to dba verified
A logarithmic unit that measures sound pressure. The "A-weighting" specifically adjusts the measurement to mimic the human ear’s sensitivity to different frequencies, filtering out very low and very high frequencies that people don't hear well. The Conversion Challenge [ S = 2^\fracL - 4010 ] Where:
A: That chart is wrong—or it is measuring dBC (unweighted) or dBA at 1 foot away instead of 1 meter. Standard ISO 532-1 defines 1 sone at 40 dB for a 1 kHz tone, but for fan noise , the verified value is ~33-35 dBA at 1 meter. Always standardize to
Industry benchmarks for household appliances typically follow these estimated conversions: Estimated dBA Subjective Level 24 – 28 dBA Extremely quiet (like a whisper) 2.0 Quiet (like a refrigerator hum) 3.0 Noticeable (typical office background) 4.0 Normal conversation level 6.0 – 8.0 54 – 58 dBA Loud (standard kitchen fan on high) Step-by-Step "Verified" Conversion
: 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
Because it’s logarithmic, every increase of 10 dBA represents a tenfold increase in sound intensity, but usually feels like a "doubling" of loudness to the human ear. 2. The Conversion Formula: Sone to dBA