Yes, Mark and Sir Quack,

A 1-dB difference in loudness is the smallest increase or decrease in level that humans can subjectively perceive.

A 3-dB difference = "somewhat louder"

2 dB = "a little bit louder"

1 dB = "barely detectable" (you have to listen really closely to detect it)

5 or 6 dB = "clearly louder"

10 dB = "twice as loud"

Smaller differences in loudness JohnK has already described.

Cheers,
Alan

Alan Lofft,
Axiom Resident Expert (Retired)