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A quick question on how the ear/brain works, so I can explain to a lay user:

Is the same level change (in dB) more apparent at higher or lower perceived volumes?


A user is asking about the volume knobs on a digital system where each click of the digital encoder changes the level by a fixed percentage, but she says the level is "jumping", though I know it's only noticeable at higher volumes. Can I explain that it only seems to be jumping?


I know that volume is perception, unlike level, so I'm asking about the variability of perception.