To calculate the number of decibels that power-level-'A' is greater than power-level-'B',
-- Divide 'A' by 'B'
-- Take the 'log' of the quotient
-- Multiply the 'log' by 10 .
If the result is negative, then 'A' is that many decibels lower than 'B'.
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Decibels
20 to 50 decibels (dB).
The decibel level for standard human voices is around 60 decibels, which is also the level for singing birds. Hearing loss occurs at around 110 decibels with painful hearing loss occurring at 130 decibels.
109 decibles
That means, a higher sound pressure let you ears ache. You can become deaf.