Decibel (dB)
A logarithmic scale used to measure relative acoustic output levels. Zero Decibels is defined as the quietest sound the average human is capable of hearing. Traditionally, a difference of 3 dB is considered the smallest change in loudness that the average human can detect. A doubling of perceived loudness is equivalent to a 10dB change in acoustic output. A 3dB increase in acoustic output requires double the amplifier power, while a 10dB increase in acoustic output requires a one-hundred-fold increase in amplifier power.