EIS: F-35 has a maximum loudness that is more than 4 times louder than maximum loudness of the F-16
Sound level, sound intensity, and loudness are explained in the Air Force draft Environmental Impact Statement (EIS).
The bottom line is, according to figures in the EIS, the maximum loudness of the F-35 is more than four times louder than the the maximum loudness of the F-16 both at takeoff and landing.
The EIS explains the difference between three concepts: sound level, sound intensity, and perceived loudness
Here are the numbers and explanation, all from the EIS:
Table BR3.2-1 on page BR4-18 of the EIS gives the Lmax for the F-16C and the F-35A