Properties of DB Scales
In every kind of dB, a factor of 10 in amplitude increase corresponds to a 20 dB boost (increase by 20 dB):








Similarly, a factor of 2 in amplitude gain corresponds to a 6 dB boost:









A doubling of power corresponds to a 3 dB boost:



Finally, note that the choice of reference merely determines a vertical offset in the dB scale:

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Specific DB Scales
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Logarithms of Negative and Imaginary Numbers