dB Defined
A decibel (dB) is a ratio unit for expressing signal amplitudes. If the amplitudes are expressed in voltage: dB=20 log (V1/V2). If the amplitudes are expressed in power: dB=10 log (P1/P2). In digital audio systems, decibels are often expressed in dBFS, the voltage value below the value produced by a full scale digital audio signal. […]