Difference between using a cavity constraint vs. a Diffuse Acoustic Field source

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VA One
Vibro-Acoustics
by Emna Ben Ali |9 March 2017
If I apply a Diffuse Acoustic Field (DAF) source on a panel instead of constraining the pressure in an adjacent cavity, will I obtain the same results?,

The results from the DAF and the constrained cavity are almost identical. The two main differences between the results will be a 3 dB offset and the fill factor effect