"William Sommerwerck"
"Bill Gill"
In one respect you are right +1 dB is just detectable.
That is how it was originally defined.

It was /never/ defined that way.

The bel is the logarithm (to the base 10) of a power ratio. Decibels are
ten times that. That a decibel just happens to be the smallest change in
level that can be easily detected is total coincidence.

** Correct.

Smaller changes can be heard under ideal conditions.

Amplitude modulation of 1dB is easily heard with tones.



..... Phil