Decibel Addition Subtraction Calculator for addition and subtraction operations of values in dB.

Decibel addition equation: $${ L }_{ A }+{ L }_{ B }={ L }_{ A }+\log _{ 10 }{ (1+{ 10 }^{ \frac { -({ L }_{ A }-{ L }_{ B }) }{ 10 } }) }$$

Decibel subtraction equation: $${ L }_{ A }-{ L }_{ B }={ L }_{ A }+\log _{ 10 }{ (1-{ 10 }^{ \frac { -({ L }_{ A }-{ L }_{ B }) }{ 10 } }) }$$.

Note: For addition and subtraction operation, LA ≥ LB condition shall be met.