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There is no point in doing either one of these.

A decibel, being the log of a ratio, is added to or subtracted from another decibel.

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Q: You multiply or dividing the decibels by the decibels?
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Cells multiply by dividing ( which is an oxymoron) is done by the process called Mitosis.

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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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