In working with sound, it is absolutely necessary to have a firm grasp of amplitude and loudness and the various methods of measurement. Key to this is understanding the decibel (dB). Most amplitude measurements use decibels in one form or another.
Thus, decibels express amplitude or loudness levels as a value relative to some reference value or beginning value. Most people begin to hear a slight change in level at plus or minus 2dB to 3dB. A 6dB change is perceived as a significant change in level and 10dB to 12dB can be heard as a doubling or halving of loudness.
Read more about this here: https://theproaudiofiles.com/amplitude-and-loudness/
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