Found this generator at Home Depot. "deal of the day"

vermilye wrote:
... A trained ear can hear a 1db level difference, however most individuals require a larger increase to detect a change unless listening to a single frequency tone. ...

I am a retired Submariner... was deeply involved in Sonar and noise reduction for many years.

For the frequency spectrum emitted by a ship, the Recognition Differential for a human was considered to be 3 dB... I used to get an annual audiometer test with my men, and I never met a person that could discern a difference of only 1 dB between two broadband signals.

Just sayin'

Our whole Sonar world revolved around using the decibel - I'd respectfully suggest that there is some amount of confusion demonstrated in many of the posts in this thread.