Amplitude

Allow me to help you understand what Amplitude is. Also this is an excerpt from my book Essential sound principles.

Amplitude refers to the height at which a sound wave appears before it is projected. When the volume is lowered or increased, the amplitude of the sound is lowered

Amplitude is measured in decibels. An audio engineer can say, “boost” or “cut” the amplitude. 

Most people can tell the difference between a 3 dB change and a decrease in amplitude. 

The amplitude of a sound wave is a measurement of the wave’s height. The loudness of a sound wave can be described as the maximum displacement of vibrating particles of the medium from their mean position at the time the sound is produced. 

Volume level is mostly known as Sound Pressure Level(SPL) in the audio world. As air pressure continually changes, our eardrums deflect these changes and send the signals to our brains to perceive it as sound. 

We measure SPL using the decibel(dB). Decibels convey a ratio between two volume levels by definition, but SPL can also represent an absolute volume level in practice. 

For more information buy the book Essential Sound Principles by Edison Muhwezi