To successfully navigate the "sone to dBA verified" landscape, memorize the (1 sone = ~33-35 dBA; double sones = +4 to +6 dBA). Use the provided formulas only for broadband noise from fans, motors, and airflow.
Unverified products often use "marketing dBA," which might be measured from further away or in "ideal" settings that don't reflect real-world use. sone to dba verified